This is awesome =)
One thing I'd like to request: possibility of using a round brush, rather than always square?
Viewing post in Aseprite Dithering Brushes comments
The way custom brushes work (that is what the extension uses) makes it impossible for this extension at least to round the pattern. Someone requested this previously and when I tried to get it working I'm pretty sure there would always be a weird gap where the corners of the square patterns would be.
Maybe in the future if aseprite supports custom tools I could make a dithering brush tool that would work much better. For now though I don't think it is possible without modifying source code.