I rather liked the idea of deducing points for bad sportsmanship, but that would really only be applicable in tournaments or scenarios where points are important. The refs can keep up with who they have tagged as far as teams by simply seeing what team the player is on.
It would get far to complex to have to keep up with individual status for just a ref. If everyone had a number and all the refs had radios to call back to a centralized scoring place then maybe...but that gets to be a lot of overhead. Doable but headache.