Haven't tried it but I'm thinking it won't be easy (if possible). Say you have a circular room. Is the length of the room the largest dimension or the average? After thinking about this problem a while back I realized that the simplest way is to just create a separate block which would have this information. That way I can specify graphically where I want the dimensions to be limited to. I use it for preliminary design and then change it out for CDs.
And then again, if it really IS possible to have this in a zone tag, I'd like to know also.
