More Brush Shapes - Square and Diamond For Exemple

The round brush is great for a lot of uses.
But, for exemple, if i want to make for somereason, an cave that has some part smoothed in a retancleline pattern.
As if someone were digging to later make a building there.

Overall, more brush types, and even smaller sizes is good.

For exemple, rightnow, i generated an Cave with Labyrinth elevation.
Made a pretty cool, cave, but i can see that certain crevaces even with the smallest round brush, is impossible to recreate, as they use sharp angles, that could be made with more "sharp" (Squares, Diamond) shapes.