Feature request: add custom image scaling for embedded images

[sensboston]

This will be a really nice to have a feature: custom image scaling ability for the embedded images (especially for fb2!). For simplicity, it should be just a percentage value of the actual screen width. As for UI implementation, simple slider from 0 to 100, with fixed step 10 is more than enough. 0 mean no scaling (original image size), 10-100 - scale to that percentage of the page width.
Cover image scaling option should be differ from embedded images.

P.S. I know, there is similar (I think so) feature request but it's too old & hopeless :(