Would be nice if you could use the standard parameters available to door leafs. I made a wish regarding materials a while back on the ArchiTALK forum, but you could extend that to other parameters as well. Would dramatically increase the flexibility of custom sub-objects.
AC18-23 AUS 4006
Self-taught, bend it till it breaks.
Win7 | E5620 x 2 | 24GB | K2200