When being invaded, or just when you want to troll around, there are tons of ideal spots in the game that make great hiding places, but your head always shows... how hard would it be for a simple crouch mode? e.g. L3?
I can see this adding a lot more fun to the game, especially if one wishes to use surprise attacks and/or simply take reasonable cover.
Yes, I know this isn't Call of Duty.. but if we can do all these other gestures, we deserve a crouch mode.