When I read your first post, it sounded like you were requesting an enhancement on the Playlists screen. i.e. the screen that lists out your various playlists. Your subsequent comments lead me to believe you're actually requesting an enhancement on the Now Playing screen. Is that correct?

No, not quite. When I use this to play butts then the list is once mixed. But if I have to then add more albums, I can not mix these playlist. I can only activate shuffle play, but that I never know which song is coming next.

One of my favorite features in PowerAmp is the Random Sort. It permanently re-orders your playlist, allowing you to hear ALL your songs in a random order. You can resume the list at any time.

This beats Shuffle hands-down when working with large playlists. Shuffle is fine if you want to play 10 songs in a different order, but if you have 500, it is very rare to get through the whole list without restarting the device. That resets the shuffle list, so you end up not hearing many of the songs on the list.

Isn't this what currently happens if you select the playlist and then tap the icon that looks like a Play button with a clock in it?

Would it be possible to include in the playlist menu "shuffle tracks" like it exists in BubbleUPnP?

This could mix the list before it is played. When you exit the program and start again later, you can continue the playlist exactly at this point, to be played without already played songs again, as in the normal performance of random play.