I'd be more inclined to handicap the kill bonus than boost the team score.

Maybe make the Kill bonus = (Kills/Rounds Played) * .80

So that portion counts 20% less. But I'm not so sure it's a good idea... Kills should still be involved. in a large way. A big killer/basecamper can absolutely hold down an enemy team and be directly involved in allowing his teammates grab all those flags elsewhere on the map.

Regarding the kills bonus that Gunny is talking about, whether or not
you can do this depends on if the stats file that Chooz downloads includes
the "killed by" information.