I have not used the “Preformatted text” button yet, so it may have the function that I am looking for. I was trying to quote text with subscripts on a reply to @robotpie on Help with understanding Entomological terms.
I think it would be useful to have superscripts and subscripts, especially when people get pieces of text from books that have those types of formatting. The subscript and the superscript buttons would go inbetween the Itailicized text button and the Hyperlink buttong, as seen in the screenshot.
It would work on both the web version and the app version.