So from what I understand, the Digital Dolly feature doesn't work in the most recent build, right? It doesn't do anything for me. But even if it worked as intended (I guess by operating the joystick while shooting), I am not sure it'd be very useful - I can't see how one could use it to implement a slow, steady and smooth parallel shift of the window.
How about my original suggestion - would it be too hard to implement a pre-programmed Dolly - you specify the shift (pixels per frame; can be negative), the starting position of the window will be at the opposite end, and when you start shooting the window will start smoothly shifting towards the opposite end (when you reach the opposite end, it can just continue recording)? In simplest case, only one additional input parameter would be required - delta_x (pixels per frame). Ideally, the shift could be made in any or both directions, by using the second parameter, delta_y.
I think such a feature would be really useful - steady, adjustable and very smooth panning, with no jerks and camera shakes from using the joystick.
What do you think?