@murat k. some of the items you mentioned are newish this probably means they have yet to be added to the theme editor.
Others may have historic reasons for being fixed.
Have you checked within the theme editor?
If you feel that you really need these to be customised then I suggest you make a feature request in the appropriate forum.
However I suspect they are on the list of things to be done. But we should remember the development team is remarkable small.
Personally I feel bug fixes are of higher importance than being able to change a few colours. This is of course just my own personal furry opinion. You are of course entitled to yours.
Post closed as it appears to have lost direction.
Many things are customisable in the Theme Editor and also in preferences. I suggest reading the Reference guide on customising CbB the are over 500 references on the topic in the guide.
@John T May I suggest you make a feature request in the Features Forum
In the meantime this thread has very quickly achieved its rabbit hole.
I woudl remind everyone here be polite and speak to each other like you are face to face not hiding behind a screen and keyboard. It is most disappointing to see such child like behaviour.
@bjornpdx Nice to hear you have had a chance to play with the Elka-X not really had much of a chance myself for obvious reasons. It is a real beast though from what I have had a chance to do with it. Do you really need more on this I doubt it, well perhaps another 10 minuets . Just sit back close ones eyes and float off drift with it. ?
@mark skinner thank you sir you are most kind. The chord progression is nothing but that basic Root, 4, 5 fundamental we all learn in the days before we discover the 6th or the added 7th or the more exotic 11th, 13th etc.
As ever your ears, time and comments are really appreciated.