Equip Any Item to Any Item Slot:
The idea here is that you can place an armor in the boot slot, or a boot in the helmet slot, etc. Having multiple copies of one awesome item can yield great advantages.

(1) Start the Campaign of the hero you want to do this with.
(2) Open his Item Stash to access his inventory.
(3) Click the item you want to replace or replace an item with.
(4) Press ESC to close the Item Stash window.
(5) Open the Item Stash window again, and notice that the item you clicked is still chosen. Now you can move that item around in any of the hero's equipment slots, with the computer ignoring the appropriateness of that item for that item slot.
(6) Click the item you want the item you chose to replace with.

Note A: To put a helm in the boot slot, you would need a pair of boots in the boot slot to be replaced with the helm.

Note B: Most of the bonuses from the items will be intact. Others may not take effect, so be sure to check and make sure you're getting the most out of your equipment.