Just to clarify things, you can be out of combat and in turn-based mode (if it's not showing the red crosshairs on your portrat, you're not in combat).
There's indeed problem with dragging the goggles to the actionbar once the combat starts because drag and drop is completely disabled for armor slots then. I'll look into fixing this at a later point, when I have a bit more breathing space, because it will probably require a bit of code reshuffling and decent amount of testing so as to not break anything else regarding these restrictions.