They added a feature where you can select "withdraw x" feature to the banking interface. It is similar to how it is on mobile. It looks like this. You set how much you want to withdraw first and then you set it on that quantity and you only have to one click the item you are trying to withdraw. No more right click is necessary. Here is a link to the post on osrs website: http://services.runescape.com/m=news/decanting-withdraw-x-and-bucket-packs?oldschool=1#_ga=2.76958357.1028140030.1538057039-203213016.1526612176