At Thorpe a few months ago a friend made a note of the codes of the photos he wanted then bought them all from the desk in the dome at the end of the day. They could access all photos from all rides and print what you wanted.
Unfortunately I think Alton Towers isn't as sophisticated, so they have to print the photo at the ride, last year we were they cannot print other rides at Towers Street.
This is how the process works at PortAventura too, so the technology is there - perhaps they can use the £1 'delivery' charge to pay for the software?! (Wishful thinking)
On the same lines, do they currently do 'we'll take it to your hotel room for you'? That would be even better!
As far as digital downloads go, can you buy them without buying the hard copy print? This would make much better value as there are a number of internet sites which would allow you to print them cheaper! Our recent Disney trip we got a Disney Photo CD after using the Disney PhotoPass and got all of our 'around the park' as well as some ride photos for $169.99 which sounds a lot, but there were over 150 photos from the two weeks (including water park ones!)
Alton Towers, Animal Kingdom (WDW), Blizard Beach (WDW), Chessington World of Adventures, Epcot (WDW), Hollywood Studios (WDW), Legoland, Magic Kingdom (WDW), PortAventura, Seaworld (Orlando), Thorpe Park, Typhoon Lagoon (WDW), Universal Studios and Universal Islands of Adventure