Good list Swoosh.

The only discussion point I would have is with the impassable terrain - and that is contingent upon pathing being able to handle it. Impassable terrain has a channeling effect which can add an interesting dynamic to the battle. However, it is flawed in STW where the units form Konga lines on the perimeter of the terrain in order to get around it. Buildings are more of the problem, but then they have a channeling effect too. However, I do agree that too many such features making the map a maze is not desirable. Actually, that is one of my red flags with S2TW castle battles as they have been described so far - almost maze-liike.