Is the title possible with Rockbox?
(I did not check the manual for this already.)
As the title says, important is that I need a direct/single button press for this feature, so no other additional button presses or menu navigations should be necessary for that.
The rest should be also clear, what ever playlist is playing, it should be modified as described, the current song should be removed from it, and directly start playing the next song in the playlist.
This feature can be used then for songs which you don't like. It would be also good if optionally we could move the current song also physically into a given dir, e.g. Recycle or Bad or Weak or "To be deleted".