I wrote a bit of explanation in the other thread about how and why this works the way it does:
http://archicad-talk.graphisoft.com/viewtopic.php?p=243812#243812
Honestly, it seems to me like a lot of the basic premises of PBC would have to be changed in order for this to work.
On the other hand, as an architect I would like my architectural application to provide me as much flexibility as possible, so I would like to be able to determine, if needed, how elements intersect - if needed, on an individual intersection basis.
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