Yeah, I use the Pose library quite frequently as well. I rarely use the NLA Editor though. I'm sure it's very useful for most character animation purposes, but ever since finding the Animation Layers addon, I've been saving a lot of time by using mocap data and then just tweaking the results with Animation Layers. I've found it provides very predictable and easily editable results. I expect that we will see some native implementation of it in future releases of Blender. Probably as part of the NLA Editor system actually.

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