With the Tracks
Local option, transforms in the source scene can appear in the local scene. This can be especially useful when you adjust rigs.

Example: Initial pose of leg bones

Freeze the transform
Save the source scene.
References
XRef Objects.
Rigs To Animate, and then XRef the object.
The Rigs To Animate preset includes the setting Tracks=Local.
The XRef'd object has the transform information you froze. At this point, you can animate the XRef'd object locally.

Changing the initial pose
The local scene acquires the new transform from the source scene. Local animation keys remain active.

Updating the local, XRef'd rig