This is probably a big request.
Anyways, one of the biggest problem I encounter when making missions is the lack of voice actors sounding exactly like the characters in the game.
Which means that if I want someone to say something in my mission, they'll have to talk with a different voice.
So I thought it would be cool if you guys could record additional phrases for the characters, beyond what is needed for the standard radio protocol.
For example, in ARMA 2 I had squads join other squads, and luckily the game had phrases saying like "Requesting permission to join your team.", and "Permission granted", etc. (I think they were used in the Warfare game mode), which was pretty lucky as that's exactly what I needed.
Would be nice with more general stuff like that, that could be used for custom missions.