Minimum Arm Distance

It was a very minor and rather unnoticed detail of the beta that grenade launchers and RPGs had a certain distance for the projectile to travel before it became live and explosive. But it's a detail I wish could be brought back, both for balancing in close quarters maps, and for a fun aspect as they would usually result in a goofy yet satisfying way to deal with anyone who got too close. 

I'm sure most people would disagree, but it's a neat detail I wish they kept, if only for the realism of the game.