I think we misunderstood each other in reconnecting. The issue before was that you could not reconnect to the Bluetooth device at all. It indicated paired and trusted but never connected. This was fixed in the last beta update which has now gone live. The reconnection with the Bluetooth speaker is the point.
To restart playback when abruptly shutting down the BT speaker is not possible as far as I know. However, if you restart the player (be it with a simple command HTTP command or a click from your smartphone) the playback should immediately be re-initiated.