Quoted from vireland:
The Pro has reduced scoring potential due to the missing upper playfield that triggers the double scoring that I'm pretty sure isn't implemented another way on the Pro.
Yeh, that is a big omission from the Pro. I can't imagine Stern ignoring that and would expect that shows up in future code updates - just a different trigger. (Maybe a certain amount of right ramp shots, or a few VIP targets then activated by right ramp).