That can be currently done in some cases. If you aren't using any voice files, you can disable the debriefing tracks in music.tbl and use the music filenames as the voices in your mission. They will only play once per debriefing stage, but that's usually enough (or you can add extra dummy stages so it plays a couple of times). I do this in all my missions.
This method doesn't work well for the briefings and command briefings though, since the music will keep resetting when you switch between stages.
Fairly sure 5 will happen sooner or later. If nothing else because I want it too 
Already took a look at it about a month ago, but that was just to see if it was possible to do a quick cut-and-paste job with the briefing text code... which it isn't, as they're handled somewhat differently. But I'll get back to it eventually with a vengeance if noone else does it first.
Good to know. It would look a bit nicer if the ship names could be appropriately colored like they are in the briefing text.
