I am sure something like this will be in future updates.  It would be cool to be able to get the wallet working on a Raspberry Pi with multiple external USB Drives hosting the storage.  Would save money on electric and wouldn't tie up your main computer.  I've never tried it, but I would assume you could merge all the external drives into one LVM.  You could pretty much go crazy with storage and Linux.  Linux makes me feel warm and fuzzy.