Is it possible to train a cat, yes. There is clicker training that helps in training cats to do agility courses:http://www.catagility.org/courses.htm
In order to train a cat to stay in one room you would have to confine the cat in the room 24/7. The room would have to be very large, because you cannot place the litter pans and food and water near each other, to do so would court disaster to the health of that cat.
You would have to make certain that there was enough entertainment in that room for that cat to be happy. Cat condos, a bird feeder outside the window, lots of tubes and tunnels the cat could hide in, ramps on the wall so the cat could exercise would not be out of line.
Right now in email I am trying to help someone who *rescued* a cat from the shelter. The cat immediately went into the bedroom, hopped on the dresser and peed all over the surface, angering the owner. The cat is only 6 months old! The woman then went out and bought a small cage, placed the kitten in the cage with litter pan and water and food and the poor kitten is now crated 24/7 because of one incident! I have been trying to get this woman to seek vet assistance to clear up a potential health issue, as well as release the kitten from the crate- but so far she insists her training is working! GRRRR!
So the bottom line is- how we see and believe that cats should be treated, with respect, with the allowance that they are cats and they are mischievous, fun and onery- is not how others view these creatures. We can take our best advice and put it out there, hoping something will click and the person on the receiving end will understand our intentions are good and not evil, but bottom line is we cannot control the destiny of any cat except for the ones under our own care. I must have 8 cat beds, beautifully made, and only one bed is ever used on a semi-normal basis. Cats will sleep where they want, go to bed when they want, and we cannot stop inate behaviour from occurring without harming the cat in some fashion.
To those reading this, that want a push button cat, I wish you good luck, they just aren't out there- unless you want to buy the new robotic cat and wow all your friends!http://www.target.com/gp/detail.html...sin=B00006782E
Ken's post says it best, and as many animals that he and Sandie have at home, my suggestion is to take his advice to heart. Love your cats unconditionally and celebrate the fact that they are cats in the first place! Don't try to change them from what God intended them to be.