Multiple rigs?

Excited about the new animation retargeting feature, and I successfully created a rig and mapped all the bones from the HeroTTP character to my own.

But now I want animations from yet another skeleton, but it appears I can only map the bones of one rig on the target skeleton, and to retarget animations from a new skeleton, I have to erase the initial mapping and make a new one.

Am I missing something, or is it not possible to map multiple rigs? And if not, is there any plans to support this?