Hi Alexander
At the present time the only key that you can monitor through Reloaded is the "E" key. That should be changed in the future.
That said there is an extension to LUA called Omega Core which allows LUA to pick-up other key strokes that can be used in a LUA script. However, two things to keep in mind here...
1) There are already keys that Reloaded uses internally... Space key to jump, "C" key to crouch, and others. If you use Omega Core you'll need to make sure that you do not interfere with these built in functions.
2) Also, in the future Reloaded will use other keys and that might bother your coding. What happens if you use the key "Q" for something and later on Reloaded uses that key for something else?
This is the problem in working through a Beta development cycle. The only thing that's constant is change, so if you spend a lot of time coding you may find down the road a major rework job on your code (not fun)
I do not have the location of Omega Core handy, but you can search the forum, or Google to find it.
Good Luck
"There is no spoon"