The heal parameter is really just to simplify so you don't need to use a second event to heal them.Also, I see how your example would be practical during TDMs and such, since you don't want to fully heal a player just because they almost drowned. I could take a look at it with my minimal TS knowledge and see if I can do anything, but otherwise it would be up to Truce.
http://www.mediafire.com/?ot2y984ah7g6t68
I'm guessing that's with Trader's idea?
Space Guy's, but yes. Is that the one you put on RTB?
