Can you disable the control-arrow key feature?
The user (at least this user) expects that hitting control-right-arrow and control-left-arrow on the keyboard will jump the cursor between words in the text area. In Todoist, it tries to indent and unindent. I can see the convenience you were going for (given that the TAB key is already spoken for), but is there a different way you can accomplish this (maybe shift-arrow-key?) or allow the user to disable it?