Quick questions- if I get a raid group of 6 going, can that party enter RFC manually (not via dung finder)? And do raid groups have massively reduced XP gain?
I'm actually not sure about this one. I seem to remember that I managed to get a nine man group in to Gnomeregan once upon a time, but I could be imagining things.
Back in the days of old you were literally able to warlock summon additional people inside your instance. This mechanic has been repurposed into the LFG/LFR functions/mechanics which are now in game. The limit now is 5 players, earlier around vanilla and burning crusade is when you could technically have 5+ people in an instsnce, that being said it was removed and out into the LFG system as stated before.