Item Scroller is a tiny mod for Minecraft 1.8.9+, which adds the functionality of moving items in inventory GUIs by scrolling the mouse wheel over slots with items in them. This is basically what NEI does/did (and Mouse Tweaks also seems to do), but separated into this tiny mod, and probably implemented in a different manner. For more information and the downloads (compiled builds), see http://minecraft.curseforge.com/projects/item-scroller