Ability to assign a shortcut to [None] in the Character Styles window.
Because you sometimes want to REMOVE a character style and it would be very beneficial to be able to use a shortcut for that as well.
Alan Gilbertson commented
Another workaround I stole from Anne-Marie Concepcion is to create a Character Style called "None" and make all of the options blank. You can then give that style a shortcut, and it will replace the Character Style of the selected text with [None].
Colin Flashman commented
I agree, this would be useful. In the meantime, there are some great workarounds in the following post, particularly post #4 from Harbs: https://forums.adobe.com/thread/324960#