There is a fairly simple way to actually fix the camping in these EQ ... I mean Static Missions.
Take the Steps of Madness for example.
Rather than have Neleb spawn in a single point at the end and everyone becomes a angry mob in the vain hopes of getting enough damage to get looting rights you use the mission system.
How?
Simple... for each character (and only ONCE for each character) when you have explored the entire dungeon (i.e. revealed the whole map) you get a KEY that can be used on an Object at the end of the mission (similar to how you originally entered the Steps). Then you and your team will port to an autonomous dungeon area where you get to fight through the last few rooms to Neleb.
A character with Neleb's Cloak *cannot*actually get a key, perhaps the key becomes Neleb's Cloak or something when Neleb is defeated.
Eitherway, the point is simple, for Boss Mobs in these EQ, I mean static missions, you spawn off a small personal mission area so each team can get in and enjoy the mission without this infernal camping.