Notification area rewind
Restore the rewind button in the notification area drop-down and lockscreen. This went away with a recent update, and I miss the feature. Alternatively, the option to add the rewind button there via a Settings dialogue would be fine.
I'm currently running PA 4.3 on a OnePlus 3T (OxygenOS 5.0.7, which seems pretty close to stock Android) with Android 8.0.0.
You can go into the app Settings/Notifications/Player screen to customize the player notification and add custom controls such as the rewind button