If you spreak as zeus it might be possible to change the pitch of Zeus. Similar to what you do when creating your profile where you can change the pitch of the radio voice. (maby some other voice changers could be added?)

So when you speak the transmitted voice to the other players gets modified. This could either be done globally ..so everytime you speak as zeus. Not only a pitch modifier would be usefule,I could also imagine a kind of radio sound modifier so that when Zeus speaks it sounds like a voice that is transmitted through radio.

Or locally for certain entities. Locally it could work by placing an icon on a unit. If you than spreak through this entity by possision (or by a "speak through" option) your voice gets altered.This would allow "different" voices for different entities and giving the role playing aspect more depths.