The VFS can handle multiple configurations merged together. This can be used to superimpose a folder or file into another directory listing.
So if you had a folder called 'home' in the VFS, then made another VFS config at the top, you can use the second one to super impose other items into the listing. You make a fake folder called 'home', double click on it, then drag a real item into it. Now when the user lists the 'home' folder, they will see its contents, plus the fake folder's contents all merged together.
This can be take a step further too for a very advanced scenario. You can use the second VFS configuration to merge another home folder together with it from a remote server. So you have a local folder named 'home' and a remote folder named 'home'... and they are merged together. When a file is uploaded, it's written to both locations simultaneously. When a file is deleted, its deleted from both, renamed from both, etc. You have replication through internet protocols. If data can't be written to both, it can't be written to one. So the data is always in both places, or the client gets an error.
There is an exception to this rule though. If you set the flag "multi_journal" to be true in prefs.xml, CrushFTP will journal the changes being made when a system is offline. This journal is then played back at a later time when the other system comes back online.
(This extra VFS info is stored in the reserved User Connection Group called 'extra_vfs'.)