I´d love to have a brush stroke type that lets me draw out an alpha/image brush similar to the type “anchored” in Blender or “Draw rectangle” type stroke in Zbrush.
This is much simpler and easier to control in an artistic matter, than it is to use decals or projection paint mode, although they do similar things.
Stuff like veins or skin details can be added much easier and in a more organic painterly way.
We would need an extra button for a brush modifier, so instead of spaced out during drag, the brush stroke would stay anchored where you put it down, then dragging it out you would both resize it and rotate it the way you´d need it.
When you let go, it would stick.