I do find the Car Radio buttons very useful, and there are a couple of changes I'd like to see with them as well.
Firstly, I'd like the number of them to be flexible.
Reduce the minimum from 12 to maybe something like 6, but support as many buttons as you have playlists in the "Car Radio" category.
So if I have 8 playlists, it would display 8 buttons instead of 12.
Or it could display 14 if I have more than 12 items.
Currently, with it being fixed at 12, I have a number of buttons where the label is cut off, even though I do not use all 12 of them.
And I can certainly imagine why some people might want use than 12 too.
I'm not sure I like the idea of it becoming multi-line though. Scrolling might work I suppose, though it seems an inelegant solution.
And the other change I would like to see, if possible, is to either move the Car Radio buttons inside the Now Playing list, or at least stop them from disappearing when the Now Playing list is maximized.
When I hit the maximize button (highlighted in red) I'd like to see this:
Instead of the current behavior, which hides the Car Radio buttons: