I just put Los on ignore. Pretty easy. :P

Seriously though... In regards to Nexus, it depends on how easy it is to turn all your toons around individually. Honestly, if you only lose about 5-6 seconds, that's actually not much time wasted given the mechanics of that fight. As long as your healer is able to keep healing during this time (can send heal commands from any window/machine), then the biggest problem is probably trying to make sure the healer is healing the right people while you're turning toons. Given that you have a 50% chance to land facing her again already, then you should only have 2-3 toons on average to have to re-face after each gravity well, and generally it doesn't matter which direction the healer is facing leaving you with a max of 4 people to aim.

Is it just that you are running out mana on the healer before you can finish her? I can see that being an issue if you lose too much DPS'ing time.