Having the spray tool randomize through the brush set when a sprite is generated and having an UI to browse brushes would be amazing,
Viewing post in Live Brush for Aseprite comments
Live Brush can be used with the Spray tool, but if you're asking for each spray particle to randomly pick a brush from the set, that's something I plan to add in the future. Right now, it's not possible due to API limitations. As for a UI to browse brushes, that’s an interesting idea, I’ll consider it