Two suggestions regarding the brush.
I would love to have an option where I could use a brush as a selection tool. It would be great for selecting intricate areas smoothly-more fluid than the free select option.
The second suggestion is I would like to be able to toggle the brush size between image pixels and screen pixels. That way, if you're using the brush at let's say forty pixels, and you zoom in, the brush stays at forty pixels on the screen allowing you to focus in on much smaller section of the image without having to manually resize the brush.
These are not my original ideas. it is how it works in Luminar. It makes it very convenient to zoom in and out of a photo and create a selection that is both large in places and intricately detailed around the edges.
The attached video shows just how convenient that feature is when selecting the face on this grotesque.