I use the Keyboard Configurator for reassigning keys built by one of our fellow Captains.
http://www.mediafire.com/?20w94wmgyzg It lists all the in game commands with the keys assigned if any, and the ability to change them. My keyboard links both enter keys together so you can imagine how many torpedoes were fired instead of entering time compression. I changed the firing key to "F" and my man cave's control room is much quieter.
You might also like to try out the Menumaker by Jimimadrid.
http://www.subsim.com/radioroom/showthread.php?t=131625 It is a powerful program that allows you to redesign each tab's menu buttons to your liking. You can also add buttons that are not in the stock interface.