Hopefully that wasn’t posted before, but I feel a bunch of dithered layer mode would be super useful.
How would that work? Well, the opacity of the layer would be interpreted as a lookup toward your favorite dithering algorithm.
That way, you could shade with your good old semi-opaque brush technique while seeing a nondestructive dithering result.
I know about the brush pressure gradient feature, but I think it forces you into shading using pressure which, at least for me, feels quite unnatural.