I like the idea, I think it might combat the grind a little bit if there was a bonus to experience, as suggested by someone, a minimum multiplier for a set amount of time for meeting a requirement.
I don't like the idea of the no team kill thing, I mean, the largest number of tks are accidental at the end of the round when the bloody equipment screen pops up and you're holding an arrow, bolt, swing, whatever, and you release automatically, I can tell you it happens a lot.
I think it should be done on the voting system as someone suggested. I think that would make it seem a bit fairer, but if were to be done like this, it should be an experience bonus, not a multiplier. So, one vote = 1 generation of exp at x1, winner gets a bonus of x5 or something. (Just a suggestion and will need balancing etc, no murdering my figures please! ^^)
Overall I like the idea, good suggestion fear.