Matt, I just mentioned specific workflow.
The essence of the request is that so BIAB saves "custom path" links.

..and maybe.... one button that switches from common to custom location for both. Should work in any scenario. For example if you RD is always in one location, but RT in two you can specify common location to be same as custom for RD and 2 separate locations for RT and whenever single button is used for switching it will always go to single drum location, but will change path to RT.

Misha.