1.) Know and setup the tool hotkeys to be quick for you
2.) Have all the increase/decrease brush size, ratio, etc hotkeys close together.
essentially just ride those size and intensity controls with your left hand while you work with your right.
There’s certain modifiers like alt is deselection, so thinking about using alt-deselecting to carve out more exact results after using the square selection tool or something.
like photoshop, clicking selection or eraser/brush tool on a spot, holding shift, and then clicking in another spot will create a straight line. you can quickly reduce a click with this method