Squeaks make thing a little more real . Like the tune but there is something amiss with the drums, I like brushes but something is little off, they sound liek they have been recorded in a different space to the guitar and the bass.
As I said you are entitled to an opinion.
Perhaps you should change the title of this thread to be a more direct request, as at present it reads as more informational than a request.
@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.