I did make a request on the forum to have Rehearsal Marks as objects which you could use to navigate a large chart and lo and behold I noticed that it was possible (as yet on the iPad only) to assign a key command to invoke a Go to Rehearsal Mark x dialog.
I don’t flatter myself that Dorico developers reacted within those few days to my request but I was pleased that they had seen the need for it too.
My specific feature request is that I can assign key commands to Go To Next and Previous Rehearsal Mark.