I just ask if I can be promoted to assistant and then you can move your people around. Not a big deal and a lot of times for WG, you can get people in the habit of promoting everyone so they can invite. Yeah, in 3.2 no need for that, but still. I made a tiny macro to do the promoting. I am doing this from memory, so might need a tweak or two.

/script local num=0; for num=1, GetNumRaidMembers(),1 do PromoteToAssistant("raid"...num); End;
It only works if you are leader, but I try to start the raid inside WG about 15-20 mins early. Then I just tell everyone that they can invite people and I don't have to babysit the invites.

So just ask nicely (whisper raid leader) if you can be promoted to assistant and you can move yourself.