It would be very helpful if we could see what a script is doing to our screen. I mean if a few (2-3-5) screenshots could be visible on the script page... or at least one.

Of course, pics take space and userscripts site is already overloaded and is not earning anything. Still...

maybe you could talk to some free image hosting site and arrange that you would give that site's link on your script pages so that people can directly load images to that site and those will get displayed on this site with script.