You might want to look into TheaterTek's DVD player software. It is designed to be as close to a real DVD player as you can get on a PC - no windows, it plays fullscreen - settings are done as video overlay, it is very remote control friendly so no mousing required. Only major down sides are that it is relatively expensive, it is copy-prevented up the wazoo and activation can be a bitch, and it currently doesn't do the 5.1 decode, it relies on you having an outboard decoder. Rumor is that the next version (pending for many months now) will do 5.1/6.1/7.1 decode.

http://www.theatertek.com/