i seriously dislike healing in combat, IMO you should get HP bonus for killing sprees, that's all
its annoying when there are like 3 guys pounding their guns at you and you're a lonely rambo, you unleash m60 fire and the HP of two goes below 20%...you kill the third one with a stubby quickly, then chase the 'escapers' - you meet them and they pwn you cause they already managed to heal...
so
4#