>About the second part, you can choose to have #tagged images automatically unspoilered by deselecting "Treat mature content images as spoilered images" in your Settings.
I already do that, what I meant is all spoiler images, not just mature-tagged ones. Like, even within #Mature threads, I still get images with the spoiler tag thumbnail sometimes (in addition to the unspoilered ones). I think it's because people actually check the spoiler image box AND the mature thread one at the same time. The only thing I can really do about this (unless I'm doing something wrong) is make spoiler images expand on hover, which is okay I guess but then they appear massive on my screen and sometimes in weird positions.
However the thread watcher thing seems to be working again, so thank you about that.