Update: I spoke too soon and overlooked the IK setting for masking, BUT a fast clip/pose stamp library would still be awesome to load with the Edit Motion Layer. 
---original post---
Sometimes animation clips need to corrections to resume a posture from the legs, arms, torso etc specifically - like taking a specific snap shot of a body part or parts in one clip and pasting it to another. Currently "Set as Default" only takes a snapshot of the entire pose. In the future it would be good to have/be able to create a library of snap shots in the same window that users could choose from for fast iteration. These posture snapshots would save and access to a folder (ideally your Avatar or scene name) but can be used quickly with the Edit Motion Layer. To simply drag in a pose can delete your existing one so this snapshot/pose stamp tool makes sense.

https://www.reallusion.com/FeedBackTracker/Issue/Edit-Motion-Layer-needs-Body-part-Masking-to-use-with-Set-as-Default-and-a-snapshot-library-that-can-be-set-as-default-for-quick-iteration

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