To easily duplicate items after the patch, you have to have: more than one of a certain scroll, and the item you wish to duplicate....To do it, you double click (A) on the scroll, and on the second click (A), hold it...dont let go...go to the item you wish to duplicate, and drop it (now let go of A). You exit your inventory, and the items will multiply. This works for many items, except for stolen items, and damaged items, so they must be good. Its great for potions, other scrolls, and arrows (basically all i use it for)
PS: if you multilpy items over 100, the game gets a little glitchy...so i dont recommend using more than 100 of the scrolls at once...

ENJOY!!!