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The Room of Requirement has limitations. It's stated so in the Harry Potter Wikia..

http://harrypotter.wikia.com/wiki/Room_of_Requirement

The Room of Requirement, also known as the Come and Go Room[1], is a secret room within Hogwarts Castle, that only appears when a person is in great need of it. The room is thought to have some degree of sentience, because it transforms itself into whatever the witch or wizard needs it to be at that moment in time, although there are some limitations. For example, it cannot create food, as that is one of the five Principal Exceptions to Gamp's Law of Elemental Transfiguration. It is believed that the room is Unplottable, as it does not appear on the Marauder's Map, nor do its occupants, although this could simply be because James Potter, Remus Lupin, Sirius Black, and Peter Pettigrew never found the room.

No it is not possible to meet a dead person in the Room. This is due to one of Gamp's Laws.

http://www.beyondhogwarts.com/harry-potter/articles/the-five-principal-exceptions-to-gamps-law.html

Also as previously stated the room does not have teleportation qualities as previously explained so it couldn't bring Voldemort holding the Eldar Wand.

The Room of Requirement has limitations. It's stated so in the Harry Potter Wikia:

The Room of Requirement, also known as the Come and Go Room [1], is a secret room within Hogwarts Castle, that only appears when a person is in great need of it. The room is thought to have some degree of sentience, because it transforms itself into whatever the witch or wizard needs it to be at that moment in time, although there are some limitations. For example, it cannot create food, as that is one of the five Principal Exceptions to Gamp's Law of Elemental Transfiguration. It is believed that the room is Unplottable, as it does not appear on the Marauder's Map, nor do its occupants, although this could simply be because James Potter, Remus Lupin, Sirius Black, and Peter Pettigrew never found the room.

No it is not possible to meet a dead person in the Room. This is due to one of Gamp's Laws:

Also, as previously stated, the room does not have teleportation qualities as previously explained, so it couldn't bring Voldemort holding the Elder Wand.

As far as the points you made...

No it is not possible to meet a dead person in the Room. This is due to one of Gamp's Laws.

http://www.beyondhogwarts.com/harry-potter/articles/the-five-principal-exceptions-to-gamps-law.html

Exception #4: Bringing a human being back from the dead

We've been told over and over again in the Harry Potter books that dead is dead.

In Harry Potter and the Order of the Phoenix, in the Battle of the Ministry, after Sirius has fallen through the veil, Lupin tells Harry:

"There's nothing you can do, Harry--" "Get him, save him, he's only just gone through!" "It's too late, Harry--" "We can still reach him--" Harry struggled hard and viciously, but Lupin would not let go... "There's nothing you can do, Harry... Nothing... He's gone." (OotP pg. 806/711)

If you could bring a human back from the dead, there wouldn't be any need for infiri, which are animated bodies that are nonetheless still dead. Why not bring them all the way back? (Unless you wanted them to be extra scary.)

If you could transfigure a human being back from the dead, there'd be no need for the Philosopher's Stone, and the Resurrection Stone wouldn't have been one of the three Hallows. But most of all, if you could transfigure someone back from the dead, Voldemort wouldn't have needed horcruxes to achieve immortality.

So, that's four. But Hermione said there are five Principal Exceptions to Gamp's Law of Elemental Transfiguration.

As far as we know there is no way for the room to actually transport somebody to the past, it can only create items / rooms. How exactly would the room transport somebody into the past?

Also as previously stated the room does not have teleportation qualities as previously explained so it couldn't bring Voldemort holding the Eldar Wand.

The Room of Requirement has limitations. It's stated so in the Harry Potter Wikia..

http://harrypotter.wikia.com/wiki/Room_of_Requirement

The Room of Requirement, also known as the Come and Go Room[1], is a secret room within Hogwarts Castle, that only appears when a person is in great need of it. The room is thought to have some degree of sentience, because it transforms itself into whatever the witch or wizard needs it to be at that moment in time, although there are some limitations. For example, it cannot create food, as that is one of the five Principal Exceptions to Gamp's Law of Elemental Transfiguration. It is believed that the room is Unplottable, as it does not appear on the Marauder's Map, nor do its occupants, although this could simply be because James Potter, Remus Lupin, Sirius Black, and Peter Pettigrew never found the room.

It's also noted that all the Hocruxes except for Ravenclaw's diadem had enchantments and protective spells on them. Also remember that in Order of the Pheonix the room was discovered so it wouldn't be exactly a perfect place to hide.

The Room of Requirement has limitations. It's stated so in the Harry Potter Wikia..

http://harrypotter.wikia.com/wiki/Room_of_Requirement

The Room of Requirement, also known as the Come and Go Room[1], is a secret room within Hogwarts Castle, that only appears when a person is in great need of it. The room is thought to have some degree of sentience, because it transforms itself into whatever the witch or wizard needs it to be at that moment in time, although there are some limitations. For example, it cannot create food, as that is one of the five Principal Exceptions to Gamp's Law of Elemental Transfiguration. It is believed that the room is Unplottable, as it does not appear on the Marauder's Map, nor do its occupants, although this could simply be because James Potter, Remus Lupin, Sirius Black, and Peter Pettigrew never found the room.

It's also noted that all the Hocruxes except for Ravenclaw's diadem had enchantments and protective spells on them. Also remember that in Order of the Pheonix the room was discovered so it wouldn't be exactly a perfect place to hide.

I also want to add that this particular room only changes itself into what the witch / wizard needs it to be. Because of the uses it had during the books I believe it can only create common things, for example:

Dumbledore's Army used the room as their headquarters and practice area. Among the items provided by the room for the D.A. were Dark Detectors and shelves of helpful books such as A Compendium of Common Cures, The Dark Arts Outsmarted, Self-Defensive Spellwork, and Jinxes for the Jinxed. Around Christmas, which was the last meeting before the break, Harry was cornered by Cho Chang under some mistletoe and the two shared a kiss. They were eventually discovered by the Inquisitorial Squad; due to the Squad wanting evidence, the Room provided the meeting room and the list of members.

I do not think the room had enough power to transport anything into and out of the room. This can also be defined by Draco moving the Vanishing Cabinet from the hallway into the Room of Requirement.

In his sixth year, Draco Malfoy spent the majority of his days within this room, fixing the Vanishing Cabinet that he moved from the school's hallway, in order to smuggle Death Eaters in and help him assassinate Dumbledore. The repair took most of the year, as Draco spent much time inside the room, and had his friends Vincent Crabbe and Gregory Goyle remain outside in disguise to drop something onto the ground should anyone approach, to warn Draco not to come out.

If the room was powerful enough to bring the hocruxes there, why would Draco even need to fix the Vanishing Cabinet? He could have just got the room to bring him / create a working one that was connected to a different one so that the Death Eaters could get in.