Make the buttons on the flashcard queue's top bar customizable

Here is how the top bar of current flashcards’ queue looks:

I’ve highlighted the important area with square. There is enough space for at least 2 more buttons. Here is the menu after clicking on 3 dot’s button:

“Back” button here is the most frequent action I use, meaning, I have to do 2 taps (3 dots - Back) for the most frequent interaction with the card’s queue; even more, considering app (in my case) almost exclusively used for flashcards, this is the second most frequent interaction after choosing an answer.

Adding a customization option to select which buttons are present directly at the top bar would be really useful.