Hi - I could think of many ideas to improve the program, but since I have probably already mentioned some of the ideas else where, I will spare you for that.
Just on thing I just thought about - if this will be a new function in version 8: When working on several part-projects within a project it can be a bit confusing to keep order in the different drawings for the different parts (t.ex. buildings) within the same project. I.e. if there are more than one building in the project. It could perhaps be convenient to have maybe a kind of a folder structure within PlanCad - so that drawings for building 1 is in one folder and for building 2 in another folder. So when you open one folder you see only drawings from that building. It is ok for me if the drawing file numbers starts from 0 for each folder. These folders could naturally follow the positions in the main project. So that position 1 contains building 1 etc. and drawings for building 1 are solely contained in "folder 1" in PlanCad. In this way one could also have a position for miscellangelous drawings, test drawings, test models etc. - but still within the project where it belongs.