Foren / Cotonti / General / PFS subfolders

I think he means having folders inside folders. This is only possible with the pre-alpha version of PFS v2 (see branches).

None at the moment, sorry.
If you're any good with PHP you can try implementing subfolders in the existing PFS. You'll need to add a column in the sed_pfs_folders DB table named pff_parentid (or something similar). Then modify the PFS core to show an 'add folder' form even when inside a folder. This form should contain a hidden field with the current folder ID as its value. In the PHP you can process this form like a normal 'add folder' but you'll have to include the hidden field's value an set it as the pff_parentid.
Then finally you'll have to edit the PFS core so in root it only shows folders without a parentid (or parentid = 0) and show subfolders when inside a folder (WHERE pff_parentid = $currentfolderid).