Please, please. PLEASE Presonus, do this. I can't imagine it would be all that difficult to expand the palette.
SO3's palette was passable, but SO4? Dreadful! Reduced number of choices, most of which are awful, completely disorganized, and after 2 years I've had to redo my standard color scheme for tracks.
The tracks I did in v3 maintain their original colors, so it would seem to follow that if SO4 can still access and display those hues, it shouldn't be a huge deal to expand the palette to at least include the color options from v3 if not to expand the palette even further. I do orchestral recordings, sometimes with 80+ tracks. Reducing the color options is actually impacting my workflow as I can no longer just glance at the track color and know which instrument I'm fiddling with.