Maybe it's a silly thought or beyond the scope of SingleFileZ, but could you implement the reader view on your side, like some "save in reader view" option where it would save the whole page, then trim it reader view style?

One of my use cases are cooking recipes, which usually come from bloated sites and weigh in the Mbs, but are only a few Kb on reader mode.

Implementing a Reader view is hard, I guess. It looks like it's almost impossible to write a program to be able to do it in a generic way for all existing websites. If one day I find a trick to do so, I'll implement it.

By the way, did you try the "Save selection" feature (cf. the contextual menu)? It allows you to save only the selected part of the webpage. With Firefox, you can even select multiple parts of the page by holding the Ctrl key while selecting contents.

Wow, I didn't... duh! Works great, very very nice!

I don't know if that's your work or if it comes from the forked project, but anyway, congrats and thanks for such a useful addon, keep it up!