You can't just stick in keys to any script.
For some it will take a bit of modifications, for others rewriting big part of the script.
And to add a key you need to add a condition (to the beginning); such as
if - the condition function
key_down - key pressed opcode
69 - keycode/ID of a key to activate the script
Your best is to either learn CLEO, which I strongly suggest, or post in request section a request to add activation key to a specific script.