They have been updating park hours only a month in advance, the hours will likely change
Party nights at MK make the other parks a bit more crowded, so yes to your logic.
The area directly in front of the roped off area is a walkway so the CM keep people moving along, they can't stand in front of you
I didn't see this personally, and hopefully someone who was there can answer on a first hand account. But I would think that you won't have a problem doing that. I was at Launch Bay during the dessert party on Sunday and I saw several people, outside the roped off area, walking around with a cup in their hand.