Thank You Steven.
Just one minor thing: would it be okay to also implement the "picture size"-slider to the radio header menu - same as like on other header menus?
Regarding picture size:
I couldn't find any central control location in the general settings to adjust the picture size for ALL covers in each thumbnail view together. Due to the size-slider isn't shown a precise value (px,%,...) somewhere, that would be helpful to get the same size everywhere.