Hmm, i'm not able to comment about moving an app which was initially installed via MAS (but i do suspect there's probably a plist somewhere which could be coerced to do our bidding).
My comment (with italics for emphasis) was about pre-existing wares, and how it all Just Workedâ„¢ without me intervening at all. [i fully expected the results would be two copies of TextWrangler... my original in the "wrong" location, and the new one in /Applications.]
Perhaps in time we will find a way to manipulate those despotic policies (e.g., the possible plist tweak).
