Simple shortcuts that greatly improve the utility

Most modern mouses have side buttons that bind to 1 and 2 on the keyboard. So it would be very efficient to use if we can customize shortcuts of the number keys. E.g. by binding 1 to pen and 2 to eraser, it would be very easy to use with a modern mouse with side buttons. We can freely switch between pen and eraser without the need to even touch the keyboard, and this would satifiy most of the daily use in Miro. I hope you can consider adding this feature.