Rearrange Doc Folders

I would like to customize my document folder arrangement. Often times it makes more sense to group the folder by a certain topic (and I'm not talking about adding sub folders). I'm currently working on a project where the association consists of 11 clients and I'm managing everything through one project to save time bouncing between several projects. In my docs folders, I have folders for each client but I have some folders for the overall group. It would be nice to put the overall folders at the top of the pane and the remaining folders below.