With Pentaton 1.9 you can now remove or reorder tracks in your playback queue. Just swipe it up from the Now Playing indicator and you’re good to go. If you prefer, you can configure the tap action to open up the playback controls in the Settings app.
Enqueuing is also easy: just long-press on any track, album, playlist or folder and you can add it to play right next or at the end of your current queue.