User Friendly Enhancements on Bulk Sales

There are a few posts I’ve noticed about increasing the number of bulk items being able to be sold. However, I was also wondering if there would be a way to enhance the interface so let’s say I acquired and want to sell more than one of a single item - I must click into the text box, alter the number then click out of the text box back onto the prompt for the amount to update and change to the designated amount for a proper sale; Otherwise only a single item will be sold from the stack (if I forget to click back onto the prompt before submitting the sale) forcing me to restart the sale process of said item.

*P.S. It may even be a good idea of quick options in some sort of drop down menu. I.e. x1 | x5 | x10 | MAX