In the South, the dividing line between Inland and Coastwise normally is the end of the jetties. In New England, its normally a line drawn through the outermost offshore Islands. In other words, the same type of experience most other places would be considered Coastwise Seatime. Similar problem in the PNW, but I have heard that the USCG has at least proposed to make some special allowances there.
I’m afraid I don’t know very much about the current requirements for AB or AS-D.