Small suggestion

[Zell]

Very tiny thing I noticed that might help out quite a bit if fixed. Whenever I press the button to yell out 'Grenade!', the sound actually seems to be delayed after I press the button by about a second. It may not seem like much, but sometimes by the time I yell out the warning, the grenade has gone off. I would suggest making the warning be yelled out at the instant you press the button. Thanks.

[Madeyes]

I've never once been saved by someone calling out grenade. Firstly you can't tell who & where the call is coming from. Secondly you can't roll away from the nade & it takes sooooooo long to get from prone to sprint (far too long in my opinion) that there's nothing you can do to avoid the nade anyway.
So i don't think it's really a problem or any need to waste time addressing it.
IMHO.

[Zell]

Well then perhaps before this happens, voice commands should be made local instead of global. :]