In my game there isn't very guns in a level.
For example in level 1 you have only a silent colt and must do you'r objective very silent ... gourds shouldn't see u.{ Like SplinterCell } So you don't need to select weapon by MMB and second reason is that i wrote a script like Hitman game ... if the gourds see you with weapons will shoot you but you can don't select a gun in you'r hands , So can to cross in front of gourds But you can to use MMB for select weapons and then gourds shoot, FPI hasn't MMB event to make a good script ,
Excusme that explained very hurry ,,, its late and i must go to some place ... if you don't underestand say me that explain you better.
The life is standby ... So decide for you'r target and then you'll see that you are arrived and get it.