TBH.... If the healer casts Regen (or MedicaII) close to the end of the fight it doesn't really matter. If there's a longer run to the next group or boss, it'll most likely fall off before then. If it hasn't fallen off when you get ready to pull the next mobs? Just click it off (and hope you don't have a healer who goes "Oh no! My HoT fell off! Better re-apply!" Though... If I do, I just stand there, clicking off Regens until s/he gets the point ^_~). It's not really that tricky.

It's worse when I'm healing ^^; Going 'damn' if I cast a Regen late in the fight so it's still up at the next pull... or if I accidentally mis-click and hit regen instead of Stoneskin*, and I see the tank just running ahead without clicking it off >.< But on the other hand, I'm not one of those "aaaah! it's chasing me! what do I do!" people ^^; Since my first role in this game was tank, I learned the hard way what happens when people run away from the tank when they have aggro. (Not to mention what happens if you don't stop attacking said mob... Looking at you, <50 ARC/BRD, kiting all around the room while yelling at the tank to get it off them...) Maybe I should start doing that when strange tanks run in with six seconds of Regen left... >:3 To see if they learn something...


*) Yeah, I know Stoneskin's been nerfed... but since my first healer go-to has always been Scholar, it didn't really change that much for me ^_~