Do you think we could get an option for a more dull, clay-like matcap? The specularity of the default actually hurts the detail on models where a matcap should work best.
For example, this excellent model shows up best in a matcap because of its tremendous detail:
Matcap actually works better for this model, in my opinion, than any other option, but when viewed straight on, the reflections blow out the color to white and the detail disappears.
Or provide a way to turn down the spec? Or change the IOR? Or could you at least turn down the specularity on the default?