It seems that Add Interval is broken since last update.
It works for simple interval but multiple (+3,+8) doesn’t work.
Windows 10 Dorico 1.2.10.139
You don’t need to specify + to add notes above: just try 3,8 in the popover. I think you’ll find it’s working fine.
Doh! I mixed the shortcuts with add and delete bars! Still learning, thanks 
Would it be harmful to accept the “+” sign in this popover?
When I’m at fast pace editing I still find myself typing + for up transpose and interval additions.
I don’t see if it could interfere with the overall logic of Dorico, but if not…
When I’m at fast pace editing I still find myself typing + for up transpose and interval additions.
I do this too. Nice if Dorico could be a bit forgiving here.
(Edited to also say that this popover is one of Dorico’s best features.)