Powerful and very skilled Jedi can do that, but the amount of focus, control and energy expenditure to accomplish this is not worth it in the heat of combat.
Something like that can be used as a distraction here and there, but you still won't get the same kind of control as you would when controlling the saber with your hands.
In Star Wars, the very small and the very large require great amounts of control and power to manipulate.
In the book "Heir to the Empire", Leia was awaken early in the morning as she sensed something was bothering Luke. When her assistant "Winter" came in to check on her, she reached out with the force in an attempt to turn the light switch off.. but she was unable to do so as she did not have enough fine control over the force.
She was able to move larger objects such as bracelets or her lightsaber and other regular sized objects. So it takes a greater amount of focus and concentration to move objects as small as pebbles, light switches or the like.
This was also mentioned later in the same "Thrawn series" book "The Last Command" where Mara Jade was being buried by smalls rocks and pebbles by the insane Jedi Master Clone Jorus C'Boath. She tried to reach out with the force to move them but there were too many for her padawan level skills and again, they were too small.
Of course Yoda lifting Lukes X-Wing is probably one of the most amazing examples of force telekensis ever shown. Not only for the sheer amount of power required, but because he had the ship floating with absolute perfect control and grace, lifting it effortlessly out of the Dagobah swamps and onto the ground with perfect, slow, minute control from start to finish. It was a truly mind blowing display of incredible Jedi mastery that even today still amazes me even after watching that scene well over 1000 times...literally.
So the smaller the object, the greater the control required and during combat, it's simply not worth the expenditure and focus risk to manipulate so many sabers at one time.