True about the door outline instead of open door, but then again you have to think about force fields. When a shuttle bay door opens they dont hide in a seperate room, a force field goes up so what you mentioned doesnt happen. I figure once the ship drops in, (think Apocolyps Now), then a holographic ramp "deploys" the troops get out and then the ships leaves. Perhaps a variant could be made also to drop in Argo Class Jeeps as well.