Being able to add or remove colors from palette graphically
We can already modify existing palette colors.
We can also import palettes
I'm thinking of having "+" and "🗑️" buttons (or something similarly simple) as well, so that having to import from a file is not necessary to have a custom palette.
It should not be too hard, since we have the color picker dialog and other ready-made utilities that will let the user know quite clearly what's happening.
If we are able to customize the palette easily, we could then make the dithering effect (#457) more useful, assuming that it can use said palette.
BTW there is Edit -> Palette -> Set Number of Colors for changing the number of colours in the palette. I don't mind having UI buttons though if it's done without adding much clutter to the status bar 👍
One other improvement that would be nice is to have an alternate way of editing palette colors without requiring a middle click, since that doesn't work on a macOS touchpad, for example. Maybe something like Cmd/Ctrl + Click on a palette color
Ideally, being able to have a list of palettes (so you don't have to import one every time you need to switch), and being able to edit the selected palette, would be the work flow here.