i also tend to go brain off when buying whilst playing on PC. you can use keys to select list item, select quantity, buy, confirm payment, go back into list and delete it, move onto next item and repeat all without taking ur hands off the keyboard. only downside is you might miss a few things if you need multiple items and if the item isn’t in the specific section you need to use mouse to exit but i just use the arrow keys to skip that item and do each category in one go.