Lots of people take refillable mugs into the River Roost, but please do remember that you will be in a lounge bar and taking up a table which the wait staff earn tips from, so it would be polite to at least buy a drink or two from them.
No conflict that I can see. All of the Preferred Location category rooms are in Alligator Bayou buildings 14, 15, 18 or 27 ONLY (although not every room in those buildings is Preferred - the King Bed, Pool View and River View rooms are all sold under their own categories). Here's an example of the room layout for building 27, with the yellow rooms sold under the 'Preferred' category:
There are 12 more buildings in Alligator Bayou though, all of which have the same amenities (such as the Murphy Beds) and can sleep five, and they fall into the regular booking categories Standard, Garden, Pool, River and King Bed. If you simply book any regular room category you might get Alligator Bayou or you might get a mansion building room. AB is not restricted solely for families of five people by the way, there are 800 or so rooms in AB versus 512 in the regular mansions, so they need to accommodate people on both sides. However if you DO have five people (excluding under-3s) then you would definitely get an AB room.
One slight caveat about the AB section by the way: Accessible Rooms have a slightly different layout which means there isn't enough space for a fold-down bed. While it's unusual for a guest who does not have special needs to be assigned to one of those rooms (which are marked with red text on my floorplan maps) it can happen, especially when the resort is very full.
Andre
