If they implement what you suggest, there would just be a group running around the zone casting sleepga/diaga/anything-ga on everything in sight. There is a very specific reason SE designed the game so that each person can only claim a single target (red) at any given time. Without that limitation, a mage+Proc/killer could literally just steal the ENTIRE camp to himself with sleepga and pic them off at his liesure while everyone stands around with their thumb up their butt.

No. Me. Gusta. This change wont ever happen. It is intentionally designed the way it is for this very reason and its not going anywhere.

The only legitimate issue this has caused was Bsts soloing NMs using multiple pets causing NM to go unclaimed back at 75 when people still did that. (That issue technically still exists, but is so rare, its not worth jepardizing the entire claim system for this very specific and rare occurence).

Sorry you cant fight 5 mobs at once and keep claim. Can always just claim 1-2 and aim at killing them faster and cycling through 1-2 much faster instead of 5 and slower. Then: 1-no one steals your stuff. 2-you dont slow everyone down by holding mobs that could have been dead already and repopping faster for everyone. Just because you CAN kill 5 mobs at once doesnt make it better to. Focus fire down fewer mobs faster and mobs repop faster. Fact.