I'm actually very surprised to find Mediamonkey doesn't support this already.
I'm on a Samsun Nexus Anroid Device and can't get it to have a drive letter. It detects as a Tablet but always crashes at the start of sync.
It seems to me that an ftp sync method would proide a backup syncing solution for anyone's devices that don't have proper support.
Provided, of course, that they can run an ftp server on the device.
I'm about to try and do the same at the moment by running "NetDrive" to assign a drive letter, but it means another application sitting in my tray and running in the background.