You Can Add Revit Server subfolders directly to the Places List

Although you can't right-click on these folders, you can use the Tools - Add Current Folder to Places option.

For Revit 2014, it looks like this in the Registry, at path
HKEY_CURRENT_USER\Software\Autodesk\Revit\Autodesk Revit 2014\Profiles\AllAnavDialogs:

You could hypothetically populate these using a script or Registry merge (if you are careful).

Note: you do not need to restart Revit for these changes to appear.

My previous post about editing Registry Places:
http://whatrevitwants.blogspot.com.au/2010/09/how-to-edit-my-places-names-using.html