I voted for better briefing/debriefing screens although I must say the "better AI" was very tempting, too. However I realize the difficulty of programming a believable and "human" AI - if that was easy Maddox Games wouldn't be programming games
Concerning the briefing/debriefing issue I have a "vision" or a "dream":
Right now the briefing/debriefing screen is combining text and map. In my opinion there's too little space for either, so the map display is not optimal and there's too little space for the text briefing (and the font is way too large, too).
What I'd like to see is a main screen for briefing from where you can open "popup" screens with the map (containing flight path, waypoints, comments etc which you can edit if you have the rank etc), another with the full briefing text (best would be to use a typewriter font just for the looks of it) and another one with recon pictures, newest intel etc ... This way there's always enough space for each part of the briefing/debriefing and no information can get lost due to bad screen layout.