Honestly what's the respawn time on these NMs, 10 mins? 12? I personally also finding it annoying to have to wait sometimes for an NM I want... however in cases like that, I generally move on or try later... it's far from game-breaking, unlike what was going on with the zone bosses that required the additional spawn points... so all that to say... I really don't think it's necessary, primarily because folks are annoyed/irritated at having to spar over a claim.