I'd really like to be able to animate the displacement channel but only have specific areas be influenced.

For example, in some situations I can't have displacement applied to the whole model, it will unfold areas like the tips of seagrass or corners of a model.

This concept could be good for animating parts on a body.. you may not be able to apply it over a seam unless you (Reallusion) make an independant displacement compatible UV layer that can overlap and not tear seams.