I know this is a suuuuper minor thing, but I'd really love some of the more unique voices in the player profile customization. We've got a decent selection as-is, but I think it'd be cool to see some more stand-outs.
For example, the IFV commander with a really heavy Brooklyn accent during The East Wind's campaign:
Or the stereotypical Midwesterner from Contact (potentially tiny spoilers, nothing major though):
Adding onto this, it'd be neat to let the player select a voice regardless of faction affiliation, so you could have Russian voices while on BLUFOR, and so on. Maybe a configurable option for servers and mission makers, whether or not to allow non-faction voices.