Furry stuff, oekaki stuff, and other stuff.
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It's easy to do, but I'm not really sure that will be a popular feature, the draw screen is already cluttered as it is, and I'm not sure that encouraging different canvas sizes on the index page is a good idea.
I would like to suggest for a button to pick a Random Canvas Size (inside the limits). Having a random canvas given to you is great for artistic flow, but I don't know if it would be easy to implement.
Thanks for the continued development.