by persistent aoe's I mean anything that's pulsing, or other persistent aoe's like shades. single hit aoe's like hammer stun wouldn't be effected, neither would cascading aoe's.
if the cap is reached, the caster receives a failed to cast message. for example say its 15. it could be configured to have no overlap (meaning if the radius of your skill touches any point of the cap, it fails) or overlap (another adjustable, say allow 33% of the casters aoe to enter into the cap). could further punish target caps with skills entering interrupt cd but I don't think that would be necessary. I have no idea if this should also apply to support skills, you would think so at first but idk. I don't have the numbers to say yes or no.
assume support aoe's and offensive aoe's have separate caps from each other.
Te lazla otstra.
List of skill and trait boon rip priority.