A simple idea will keep away those pesky exp thieves!
Only people in your party can attack monsters that you have attacked within the last 5 or so seconds...A simple right click an extend the invitation.
To prevent looting, put a small 15-second or so delay in which only the people in the party of the monster\'s killer can see/take its loot.
Sorry if this has already been mentioned, but I\'m tired and I gotta go to sleep, and I wanted to write this down \'fore I forgot abou\' it.