Screw that, instances killed the community and turned EQ into an MORPG instead of an MMORPG.
First in force/First to engage should be the rule, plain and simple.
First in force: If the target is up, the first raid force to arrive in zone and be actively working towards the target gets it.
First to engage: If the target isn't up and multiple raids are sitting around camping the spawn, when the target spawns, the first force to engage the target gets it.
Pretty simple and relatively fair to all involved. Sure, there will be some bickering over what constitutes a 'raid force' but frankly if you have sufficient force you'll be clearing your way in and engaging the boss, which makes it pretty clear who was first in force.
Don't know the history of this server well enough to know what this isn't the rule here, but it worked out pretty well on Live till instancing ruined the game
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Oh, and yes, some guilds on live chose to ignore first in force and tried to steamroll/leapfrog etc, but usually that didn't go so well for them, because the guild that was there in force usually had no problem engaging the target anyway, or in the case of a leapfrog (ie: running past a guild fighting Aary to attempt to take NToV) it was pretty simple for the GMs to determine what was going on and banish the offending guild from the zone. Sure, GMs didn't always show up in time to deal with it, but the fact that they did sometimes enforce a no-leapfrogging policy was enough to deter it most of the time.