step 1. find all the functions that you dont need and delted them from the keyboard layout. for example if you have track ir to look around do you really need the keyboard number pad to do the same thing ?
step 2 with all your new found free keys, re assign some buttons to the functions you do need. HOT TIP. the less key combinations you have the more solid your game will run. you definaly dont want to be inputing for example alt j , ctrl t, and del for padlock at same time, other wise you could find yourself looking at the desktop task manager (alt ctrl del)