Autocorrect and/or Custom Dictionaries
It would be great to add an autocorrect feature or custom autocorrect dictionaries (the latter of which would be a lighter lift). If I'm taking notes on a call for example and am rapidly typing a lot of text, it'd be great to automatically fix typos.
Creating a custom autocorrect dictionary might be a lot of work, but if it's easier to just add the functionality and let users make their own dictionaries (or sharing them), I wouldn't mind making one for myself as I go along.
It would also be helpful because it could function as a sort of text expander!