Two suggestions regarding Motion Links:
1) Please add an icon in the actual Model to represent Motion Links, just like Joints have icons that indicate where they are in the model. When we add a Motion Link, it gets added in the Browser, but there's no visual indication of it in the model itself.
2) When Fusion NAMES a Motion Link it gives it a default name something like "Motion Link 39". I think it would be more useful to name it based on the names of the two joints that it's linking, something like "Motion Link between Rev5 and Rev12".