Simon.
thanks for explaining the issue from a developers standpoint.
its obviously a no win situation for the developer ie pg.
i now see why you chose a common dir.

my concern was mainly for the new pg user who possibly wonders why a particular win dir is getting bigger over time ie the bb common dir; and might not be monitoring such.
thus i would suggest it be made clear in the docs // help about this aspect/issue.
best
oldmuso

my songs....mixed for good earbuds...(fyi..my vocs on all songs..)
https://soundcloud.com/alfsongs
(90 songs created useing bb/rb)
(lots of tips of mine in pg tips forum.)