Well, I got a couple of suggestion...
Clanwar mode with bases
Something with shooting from a chopper; with the minigun.. ( Like a 2vs2 )
A gamemode where you have to get like 5 turfs.. team that got it first wins..
No RPG, heat seaking RPG, and no satchel charges at spawn locations.. or let everyone be immune at a spawn area.
Greats and good luck making the mod , Shizz