Currently:
1 kill - 1 score to my team
1 suicide or teamkill - 1 score to opposite team
They're equal (!).
I think its wrong. I think suicides and teamkills aren't equal to "full" kills. I suggest the following scoring strategy:
kill - 3 points to the team
teamkill - 1 point to opposite team
suicide - 2 point to opposite team (you can suicide together with an opponent to get more scores, this should help limit exploiting)
Few bright examples of unbalanced scoring:
http://img716.imageshack.us/img716/7752/spiralknightsblastnetwo.jpg
http://img849.imageshack.us/img849/7752/spiralknightsblastnetwo.jpg
http://img801.imageshack.us/img801/7752/spiralknightsblastnetwo.jpg
http://img84.imageshack.us/img84/7752/spiralknightsblastnetwo.jpg
This will fix issue when our team loses because one of teammates goes around and stands near our bombs, or teamkills constantly and on purpose (there are tons of people like that.
I like the idea. Gives kills more weight. Never really like the idea that i can work extra hard to get a kill to only get the score erased by getting teamkilled. (At least in my mind that works that way)
Now to if there is some way to get credit for trapping opponents behind their own bombs. Though the suicide score you suggest alleviates some of the sting of looking like i killed no one at the end of the game.