I would like to see the ability to link morph sliders. For example, when I'm separating heads from the body, sometimes there requires an additional morph to make each slider functional as a separate morph. This extra morph serves no purpose except to provide a transition between the head and the body to make a unified character.

If creators could both link this morph so that it only triggers automatically when both the head and body used, and keep this morph hidden, I think that would add a significant amount of functionality for content creators. And it would provide a benefit to end users.