Just a random thought.. Maybe a mechanic for DayZ 2... We all know you're working on it... if not.. ...

Could maybe work as a mod.

But maybe to add to the realism when grabbing loose ammo, it's a hold action where as...

The longer you hold (up to a set amount you could physically hold) is how much ammo you grab.
Currently, loose ammo the player instantly picks up an exact amount.
I guess instead of a long action, there could also be a slider/scroll option, but that's getting more into RPG type mechanics..

Say for gun reloading..
IRL you'd be at lease 30x slower reloading loose ammo from your pockets..
For a speed multiplier, there could be an ammo pouch (or the new fanny packs)