Wow, thank you, you understand absolutely :), maybe I should study all nodes for complex thinking, not only what I am looking for.
For explain, I have hand with controllers on each joint and that controllers are connected to user data (sliders). And I like idea that I am
animating in viewport with controllers, sometimes tweaked with sliders, but I can select all sliders and copy/past whole pose of hand, on keyframes or
to scenes. I know that there is still new pose manager, but still buggy, for me crashes when added some controllers. And I need to do transition in
workflow. So thank you very much.