So it's a rare occurrence to even be in this situation, but I figured it was kinda gamebreaking.

If you have both the shift mode workaround for controller support as your active and a second active slot wtih an item in it, their charges become linked. If your shift mode is ready to go, you will be able to just spam the second active like there's no tomorrow. Your charges will fill up as your shift mode meter does, but using your second active won't drain them.

I just spammed Krampus' head in every room to victory, was super fun but obviously not intended lmao