It's possible to upgrade a placed rack to the next tier by left-clicking it with the proper upgrade material in hand. This is really convenient, and it'd be nice if you could do the same with controllers, especially considering upgrades (sort/insert) are lost when the controller is broken.

Exists, it's just the block form not the ingot form.

Hey @Raycoms , you're right! Clicking the controller with the correct block in my hand upgrades it. Ok, closing this issue.