1. if we have moderators, we need rules o.o
2. moderators are also only players who dont see the code.
they only can guess.
3. implemating of a new source of error. humans
that doesnt prevent afk-farming, too xD
one player is shaman and must go afk quickly in an area, coz of reallife^^
so he farms more or less afk.
and for that he gets problems?
doing nothing except beeing online?
furthermore you dont need minions to farm afk....
so a max-duration wouldnt solve that problem, too.