Those are good ideas, I could definitely figure out rounded brushes. Pressure sensitivity might take a bit longer though.
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I only took a small peak at the Aseprite API when making a touchscreen undo/redo button and I saw ya use some arrangement of pixels in your code to generate the patterns.
I didn't look too deeply into either, but it all looks more advanced than what I understand atm. I can't (yet) image the amount of work that went into it.
Thank ya so much for making this tool. It's helped a great deal with making variably shaded drawings for the Playdate.
I am glad you are finding the extension useful.
I took a closer look at the api/code and I am not sure how possible it is to have rounded brushes. The main issue is that custom brushes in aseprite are based on having a fixed image that gets tiled - if I make the image circular, the pattern becomes circular without affecting the actual brush shape. To see what I mean you can try drawing a circular pattern and then selecting the pattern and pressing CTRL+B to create a custom brush for it.
As far as pressure sensitivity goes, I don't really have any way to test that and I doubt the API provides any way to detect it.
Maybe in the future if the API becomes more advanced I can create a custom brush tool as opposed to a menu that creates custom brushes.