I'm not sure if this counts as strictly a "Stats" idea, but I would love a way to separate "tags that feed my custom charts" vs "tags that I actually use as... tags."

For example, I have multiple sets of tags for "original-language-X" or "set-in-X" to supply the data for my custom charts. But I have other tags that are for things like particular book lists that I'm reading, or whether a book is a translation or a sequel, etc. And that latter category never has a chance of showing up in the Tags chart because it gets dominated by "original-language-english" and "author-nationality-united-states" and other tags that I would rather not see in that chart at all, because the data is represented in the Custom charts. I'm attaching a pic of what my Tag Stats graph looks like for this year, and only the three circled ones are ones that I'd like to see in it.

I would like to fine tune which authors appear in my Most Read Authors chart.

If I read comics which have a lot of authors, then they quickly dominate my chart, which, TBH, renders it rather functionless to me. Currently 9/10 authors in mine are from comics. I cannot use this chart for anything interesting anymore.

I am interested in EXcluding some genres perhaps, which would narrow things down immediately.