Now that 0 dmg teamhit are not reportable (except nudge and kicks, but that's interrupting, so good thing it's reportable), i wouldn't mind changing the report system.
A limit of 3.
OR
A limit of 5, but the possibility of reporting for 1 or 2. Sometimes, the teamhit is SO obvious, you really feel like 1 report isn't enough...
Both would make griefers kicked in 3 reports.