Hi Vincent - I think we have the same understanding of how it would work. Yes, the user should specific the start and end image (ie. watersurface0001.jpg to watersurface0010.jpg) - and they would loop back to the start. The plugin would automatically change the image node to point to the correct jpg for each frame.
I think this would work very well, and be reasonably easy to implement.
After the Christmas break I will be putting together then net version - so will add this to the list.
Paul