Remember This exploit?
It dumped off the plague on a dead person so you didn't have to deal with it.
Arguable how useful it was with the steep enrage timer.
Anywho, my guild recently discovered a new bug that's much less convenient and far more situational, but I figured I'd share anyway--
If you have a priest die and turn into the Spirit of Redemption, you can pass the plague onto it and it will disappear upon "death".
It's not a huge exploit, but if a priest happens to die, you can make the best of it.