Would not it be interesting if I had a button in the Brush palette to enable the ability of a brush to affect the visible tools? Something like a button on Gizmo. Can you do this by script?
Sadly that isn’t possible. I think if it was possible to sculpt across subtools then it would already be in ZBrush. I imagine that as you can have many millions of polygons for each subtool the memory requirements would be prohibitive.