The Transporter Room in LTBYLB is different to every other one seen, in that the wall adjacent to the door (on your right as you enter) sweeps forward at a very sharp angle, instead of the usual 90 degrees. Add to that that we only see the front two pads, and I'd suggest that what we are seeing is a smaller, auxiliary room instead of the usual one(s).
Perhaps this is the Transporter Room that is used when saucer separation occurs? Those impulse engines are not in the same league as M/AM reactors, a small T-Room is probably all they can handle!
Hmm. The reason it sweeps forward is because of the computer station. It looks like the same old transporter room with the addition of a computer station attached to modified wall. It looks alot like the setup from "Assignment Earth"...