Some more thoughts from my side. Just as brainstorming ideas. I stil think the user interface is not bad at all.
- Only show necessary data. Do I need to know all the values? For example do i really nee to know the position of the rectangle. I can see that in Lightroom and when I'm done edititng I switch to LR-Timelaps. There I might not need to see them. Maybe just which settings change over the images not how they change.
- Show a list (kind, values that are effected) of transitions (perhaps also deflicker) that are made to the pictures (mor like Layers in Photoshop). Then you could change the transitions later in the process again. This could lead to project files where the transition data is stored. Just save the changes to the files when you hit "export".
I know that is a totally different approach and a lot of work to implement
But perhaps these ideas lead to new ideas that can make LR-Timelaps even better than it already is.
Best regards
Eike