What feature do you want to see added?

I see emailOauth2Token, but there is no refresh token there. How would you expect to use it if it expires in 1 hour?

Are there any alternatives?

There is only one alternative for gmail which involves adding 2fa.

Anything else?

Maybe I didn't understand correctly how the whole thing works, but there is no clarification about emailOauth2Token anywhere in the wiki or on the readme page.