(...) Get the best of both worlds and do both. Check for the environment variable and if it is blank (or non-existant) default it to a "known" sub-directory. W (18 years ago, 9-Jul-07, to lugnet.cad.dev)
(...) That makes sense to me too. Based on the coincidental informal convention already used by LDView and Bricksmith, I suggest $LDRAWDIR/Unofficial as the default unofficial parts directory. It is structured like the regular LDraw directory with (...) (18 years ago, 9-Jul-07, to lugnet.cad.dev)
