Todays day three of making and sharing new changes I'm making to the codebase. The change made today allows the ability to select a second color! For people who have used certain apps like aseprite you will recognise this functionality.
In the palette bar if you left click on a color you can then paint it using left click (which is how it was before). Now however if you right click on a color you can paint it using right click in addition to having something set on left click.
This means if you are working on an area that has two colors you can select one of the colors with your left click and the other with your right click and then paint it without needing to swap back and forth between the colors.
You can also hit the x button to swap the colors in your left and right clicks (changing the one in left click to be in right click and vice versa) which can be useful if you want to paint with left click mostly but still want to store another color for easy access