I know this is an old quesiton but it comes up first when searching the web for an answer so I am updating with my solution.
To stop a door from snapping to walls open the door's Shape Sheet and under the "User-defined Cells" heading find "SubVisDoorFrameToWall" and then set it to "=0", deleting the "=ThePage!User.VisDoorFrameToWall" that is there. This works with the individual door for which you change the value.
Thanks to Mark Nelson [MS] for giving me the hint the led me to find the solution.
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