Please, implement function and shortcut for setting time line Playback Start/End to the selected motion clip.

Add this as a setting/animation option -> Adjust Playback Start/End automatic when assigning new motion clip.

As you do not have any preview when browsing in the motion library for animations (this should be added, please see implementation details in other ticket) when testing and assigning new motions clips, its hopeless when the loop-points must be manually set for every test, to see the animation in repeated in a loop.