How about changing otherwise peaceful monsters to lose aggro on players after
certain time has passed? It is just a minor thing, but it would be nice if
monsters in full shape did not remember players' bad deeds after they have
been left alone for a few hours.
Monsters staying aggressive is, of course, just a minor hindrance and mostly
affects only players who had been resurrected in the same room with a bigger
monster with aura of hate on or newbies who had accidentally attacked the
navigator in the adventurer's guild or something like that.
Heidel's awesome wiched witch newbie quest area has similar system built in -
it just works and makes exploring the quest a little less troublesome. I would
certainly like to see other monsters lose aggro just like that as time goes
by.