Hi, I think you can change the order, since the color-palettes are dictionary tiddlers and not JSON. … But … Most colours have naming schema. … which groups them together. Eg: alert, sidebar, tiddler, tab, … and so on. … Mixing those groups IMO will make the colour list even more complex.
There is a thread about new preview elements in the Palette Manager. I think the new functions can help to make editing of palettes much easier, since users have a relation between the colour name and the actual visual element that they define.
More details can be found at: Palette Manager - Test Version - #13 by pmario