hmm how about
Assault Ambush at 6 kills.
an ambush team appears (20 or 30) from behind trees outside the map and shoot passers by. (200 for each one u kill)
Sniper Ambush at 9 kills
an ambush of Ghillie snipers (10) at VERY long range snipe and take targets down quickly and accurately!! (600 for each one u kill)
I't would probably make online alot more war like with tactical ambushes u command