Ok... Some may not be FPS specificaly, I'm just wandering around.
I think there are 2 main categories that would be interesting:
Action driven, like armour, hit%, hidden probability (stealth kind of thing) variable modifiers (strength, health, dexterity)
and
Story driven, like gold, names, items (like a backpack where each variable would be a backpack slot) and even skills that would mess up with the variable modifiers.
Like I said, this is not very FPS wise, but you can dream a bit on top of this maybe.
Hope it helps, good luck and keep up the good work.
V
I'm pretty sure I know everything. Doubts are something rare in me and I am never wrong, as this signature can prove.