Well, I had a look at it, and it seems very well designed so far. I used to code a LOT in old ArmA 2, which got me into scripting which then led to me making games as I am now. I am currently buggering around in the Alpha, trying to make a 4 player co-op mission involving surviving on Stratis after a failed invasion etc.
So, I believe that with your permission, myself, you and a few others could form a temp team to finish this gamemode. It really does seem like an amazing gamemode. It's not like Trouble in Terroist Town kind of games, as it actually has tension and objectives, if you just jump around waiting for a traitor to do something the tension disappears, but like you said, being the one with the gun also makes you the one most likely to be "accidently" run over.
Anyway, are you up to it mate? It's always better to work as a team. I'd love to see this released as a full on map. My gawd, the tension!
EDIT:
Straight up, I have an idea. I am going to try and code three things. 1. Medics doing blood tests. 2. Repair Specialists repairing the helicopter (aka requiring parts) 3. Explosive Specialists working on the generators. I don't believe there is much use for explosives in a gamemode like this, although you may want one or two as a very rare spawn.