I also often wish I had more colors too. I end up “uncoloring” windows (ctrl-drag from window to self) to free up my colors, which is annoying.
Also, I’d really love a 1+2+2+1 view. If I’m doing control points with only four images then I have one column of the two registered, a second column with the unregistered or second component, and then the 3D view. The sixth pane goes unused and is a waste of space.
When I’m trying to do control points with 6 images, I use the 2+2+2 for images (plenty of pixels on my 4K display) but the fact that I can only really control four of the windows at a time and have to control drag to the other two is a pain in the ■■■.