Islandmon, I was working in autocad before..where unlimited number of opened drawings is possible. And if I have a big project, I really need to edit about 15drawings..different floors, different revisions, references,etc.
And it really annoys me because it's only matter of some system variable. There cannot be any physical barrier why to open only eight drawings. As long as you have enough RAM you are fine.
There are quite a few things I really miss in Vectorworks (compared to Acad)however I somehow got used to be without them, but this issue with maximum of opened drawings is really pain in the arse for me. ;(