Why didn't the Delta Flyer have a transporter pad? We know Voyager is low on energy, so why use site-to-site transports regularly (site-to-site uses more energy due to requirement of two transporter cycles). If they use more energy, they're better off installing a pad.
I can understand emergency transporters being site-to-site to save space (for shuttlecraft, etc) but the Flyer was designed as an away-mission vessel, which would require regular use of the transporter, why not install a pad like a Danune-class runabout?