Tho these could probably be achieved with scripts, its not that good i think they would work best as actual features in the software.
Scale3X & Bilinear Scaling Filters (Or other Sprite Scaling Filters) & Advanced Color Picking and Customizable Color Bit-depth
Asesprite extra scaling filters mockup by me, other pictures are from Cosmigo ProMotion NG
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As a scaling method These filters can be extremely useful for pixel artists.
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Give users proper color bit-depth control in their project so they can accurately mimic the color limitations of certain computers and consoles.
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And on the bit-depth control note, Make any color wheel also adhere by the color bit-depth limitation so color picking with a limited color setup isn’t a pain.
I Love Aseprite i just wish it had some extra scaling and color tools.