Ok, cool. It does bring up another question I meant to ask - do the removal of @font-face declarations have to be so granular? At the moment removing embedded fonts, css @font-face and html @font-face delcarations are three separate options.
I would anticipate most users being happy to just tick "Remove embedded fonts" and have it also remove *any* font-face declarations. Are there any scenarios at all where this would not be the case?