Would it be possible to have the left sidebar behave the same as the right sidebar? On the right you can dock items (such as the Library browser, Layer database, etc.). On the left the items are organized a bit differently (as shortcuts in fixed tabs). Currently this used for Looks, Fixturegroups, Selection groups, etc. It seems that the system on the right makes it faster to switch from one tab to another. Also I like the fact that you can auto hide and pin items. A bigger area for the actual visualisation or wireframe view is very useful to me.