kMS exp formula

I'm all for making leeching ineffective, but I agree with those who said this formula also kills party training. Or at least some forms of it.
For example: Himes. No Priest will want to train there anymore, if all their work (and potion burn) at luring will get them miniscule experience, just because all the kills are credited to the attacker.

I believe the right way to go about it would be an "afk detector": if you don't move or attack in X seconds, you go into "afk mode", in which you get no exp whatsoever.
I am aware people will quickly start developing 'bots to circumvent this detector, but *shrug* that's no reason not to implement it.