Is there a way to alter a category title without removing all the items and deleting that particular category?

There is sadly no way to do this right now, but you don't need to remove all items from a category before deleting it, they just move to the main category again ^^

They do? That's a relief! I was under the impression that they deleted with the category. That will simplify things a bit, though I'll still have to add them back in. Thanks!