You know what would be even better?
Replace the kill counter on the scoreboard with a damage counter.
You can do lots of damage and still not get credit for the kills. As a pikeman (Ahem... long spearman... lame), many of my kills come from people who have been weakened by teammates and then I go in and kill them while my teammate is recovering from an attack. My teammates should be getting credit for doing work, and I should be getting the right amount of credit for the work I do.
EDIT: After re-reading your post (gah) I see what you mean... yeah, it would be interesting to know who hurt who. Maybe it could replace the equipment screen at the end of the round?