Basically instead of having only two options (AppData or local folder) have the ability to specify where to store it.
I have a scratch disk I use for exactly this kind of thing and I don't want to use TweakUI to point my entire AppData folder there, but I would like to be able to configure Vault to allow it to store data in a given folder of my choosing.
Feature suggestion: "store working folder data here...&
Moderator: SourceGear