alot of people say to use the flashlight key,
can i bind script functions to any other keyboard keys?

in a script what would the other keyboard keys be referenced as?

In MP, Flashlight.
in SP, Back, primary trigger, secondary trigger, jump, zoom, action, aiming changes. SP can use player_action_test's, which check if ANY player has met the criteria... So you cant tell players apart with action tests.

With gimmicks, you can use animations as triggers you monitor. It would be easiest with OpenSauce, although with AI you can watch for animations. So, if your doing that, anything that can have an 3p animation assigned to it can be a trigger. Other than crouch, your not really gonna be able to use default animations to trigger things since they dont have set things you can watch for, so you would need to include special nodes that just move to certain areas to trigger it.

Anyways, open sapien, console, script_doc. it will generate hs_doc.txt in your HCE folder (If you're using OS_sapien, it will be over in 'documents\my games\halo ce\opensauce\reports\') Read through that a few times, it will help you.