Gonna start by saying that this is the best controller support mod for Java out there, but there is something that would make it better.

Holding the grab stack button, probably A for post people, should even evenly spread out whatever resource you're dragging, like it does with keyboard and mouse when you hold left click over slots. Currently you can place down one item at a time with X, but its really slow and if you're crafting a ton of stuff, all you can really do is just mash putting an item over and over again. If you could spread items equally across where you drag them it would make crafting a lot easier.

Another Controller mod does this, I think it's called Controller Support, but I much prefer this mod in most cases.