Have a keyboard shortcut for subscript and superscript which will work in any text-based app, including Microsoft Word, Open Office etc.
Mainly to write chemical symbols – carbon dioxide, nitrous oxide, isotopes of elements, some maths and statistics calculations…
With toggle action of further shortcut for return to normal script
Otherwise, you have to go through a long rigmarole, e.g with MS Word it takes 8 mouse movements. If you are writing an article about climate change it is very time consuming.It needs to be for any app, because the article might be written in a word-processor, with notes taken from Notes.