Item Drop down menu Option wishlist this is a wish list item.. and just an example of what I'm referring to
Just want to add my 2c on what I wish more devs would implement. Having buttons for [-1000][-100][-10][-1][0][+1][+10][+100][+1000], and if there's space, all the -500, -50 etc. And of course you can go about this in a smart way by dynamically creating buttons based on the actual stack size. No need for 1000 button if you only have 500 items.
