Hi sweetsorrowsims,
If you just need a single frame, you can:
1) Move to that frame in the timeline view.
2) With that frame (pose) showing in the 3d view
and your cursor in that view, press "a" (twice if necessary) to select all joints.
3) While the cursor is still in the 3d view, press c (not ctrl+c) to copy the joints to the clipboard.
You can also use the arrow-clipboard icon in the lower right corner of the 3d view.
4) Then
*in the same blender session* use file -> open to open the blender file you want to paste the pose into.
The pose will still be in the clipboard since it's the same blender session, just with another (your destination) file open within that session.
5) Look at the timeline view in the file you just opened. Make sure the "Active Keying Set" in your newly opened file is set to LocRotScale (or at least LocRot).
6) In the timeline view, select the desired frame to paste the pose into.
7) Move your cursor into the 3d view and press v (not ctrl+v).
The pose will be pasted from the clipboard. You should see your copied pose appear at this frame.
You can also use the clipboard-arrow icon in the lower right corner of the 3d view.
8) Now commit the pose to this frame by pressing i (for insert) to insert (save) the pasted keyframes into the frame.
If you are successful, you will see a message in the info window saying: Successfully added ___ keyframes for keying set LocRotScale (or LocRot if you selected that above).
Now when you move through the timeline your new pose should be at that frame! :D
Above, I show several images with messages like bpy.ops.select_all(action="TOGGLE"). To get that to show up, drag down the Information window bar:
It's possible to copy whole sets of frames using the dope sheet view. I am going to try that a few more times before writing that up.
