Thank you for the suggestions. Yes, for different resolutions one would need different blending distances.
It is not clear however how SfS would perform if images with various resolutions are used, unless the resolutions are not too different. The current approach does some rather naive bilinear interpolation from the ground to the images, and it is assumed that the DEM itself and the images are roughly at the same resolution.
Hope the tool is working for you. The registration part is always the hardest, and it appears that you are looking at advanced features, so hopefully all is good up to that stage.
I would not be able to add more features for the time being. This year we had no funding for this project and even as it is I took some time from other projects (and sometimes free time) to address issues in it, so I hope perhaps with some careful tweaking of existing params you may arrive at some satisfactory solution. One more knob to tweak, btw, is the --robust-threshold. It prevents images which are having a hard time conforming to the solution from dominating it too much.
Happy to hear more about your progress. You can always email me apart from the mailing list with questions or issues (with the caveat that I have time for questions but not so much for adding new functionality).