If you've played any Tribes game, this should be familiar:

For those who don't know what that is, it's basically a quick-chat menu that was used in-place of VOIP, design-wise, back in the day. Since Tribes 1, team-based FPS games have had something like it.
In Tribes, pressing buttons in order would broadcast a specific voice-command to your team, with everything from,
VGS ---> Shazbot!
VGX ---> Damnit!
VGQ ---> You Idiot!
VRG ---> Repair our generator!
VFF ---> Get the enemy flag!
VFR---> Retrieve our flag!
VDB---> Defend our base!
VTA --> Target acquired
VTO --> Target is out of range
and more.
It wouldn't necessarily require voice talent specifically for MWLL. We could just borrow voices from other games, like Tribes 2 or PS. I understand its unprofessional, but this is still a mod and sometimes a small content-corner cut can allow a huge addition to gameplay easily. If you're really considering this feature, I'd be willing to round up and organize them for you.
I also understand that Crysis Wars already has something like this in place, and I think its still usable. Thus, I imagine that means less work for this feature.
/I'm also pretty sure this was suggested before. Why make new thread? ... I dont think any of the old threads have replies since the switch to Crysis Wars