I still think the Zonewide mob shout is, by far, the least intrusive and most effective measure that could possibly be taken. Whenever a mob is aggroed from an unaggro state, it should shout.
This would even clear up the complicated DT/FTE situations. You'd get two guild engage shouts, but the clear rule would always be last guild to be shouted has primacy of claim.
-Xasten
|