I've posted this patch quite some time ago on the old Yahoo! group, but never got
a response. We've been using it successfully here for a number of years now, and
it saved my back in at least a couple of times:
http://tech.groups.yahoo.com/group/qcad ... ssage/1838
The actual patch can be found here:
Feel free to comment on this (including "that feature is available in the professional
version anyway" ;-).