Customizable Action in Inbox (One-Tap Task Completion)

Feature suggestion:

As I open the inbox, I want to be able to complete a task with just one tap instead of two. Currently, I have to tap the "+" button and then choose "complete." I am not the type of user who moves tasks from the inbox to the calendar; instead, I put tasks without a deadline in the inbox, and those with a deadline in the calendar. Therefore, I don't really need any option besides "complete" in the inbox. It would be cool to have a customizable "+" button that I can change to a "complete" button.