How can I specify the root folder for multi-portal dnn installations?

 

I need to be able to specify a root folder for images, etc per portal.

 

If I specify UseDNNRootImageDirectory="true" in the webconfig I can see all the folders in the root of the individual portal. If I change that to false I can specify the directory information in the security configs for each "role" but that information then becomes a global setting accross portals.

 

There needs to be a way to set the root directory and have that be applied dynamically per portal. At least until the editor can grab hold of the permissions by portal and role.

 

Any ideas how I can accomplish this?