A dark/light blur at the top and bottom bar would also be cool; anyway, he's the DEV and he chooses the best for Poweramp, but, as I said, it's an optional feature
Thanks for the clarifications and answers
@maxmp i really wanted this option (which is optional) precisely so I wouldn't use third-party skins, and it looks weird just to have one bar without a background… bg brightness can also be adjusted manually