I'm thinking this might of been made, I don't remember, but it is a good idea.
You should get more health for a knife kill. Unless your running a knife mod.
Or you could make it more interesting, Kills by Players Ranks.
knife kill = 20
Nade kill = 15
Noob kill = 5, You killed a guy that never kills anybody.
Random kill = 8
L337 Kill = 20, or
Awp Whore = 20 This guy is amazing at camping and awping all damn day! He never dies!
Nading awper = 40 health
If player kills awp whore with an awp he gets 5 health.
Underated guns never used for example Dualies. Death by dualies 10 health.