Hi, is there a way to just set the play head position and start playback from that position, without selecting ANY notes og rests.
You can enter the exact measure at transport bar.
No, unfortunately you can’t currently set the playhead position by typing into the Transport in Dorico, though I imagine this will be possible in the future. You can move the playhead using the - and + keys on your numeric keypad, if you have one: otherwise, you could assign new shortcuts to Rewind and Fast-forward in the Play category (in the Key Commands page of Preferences).