It's a gear appearance option - it goes in the shiny new gear appearance ui. As opposed to a sub-sub-sub menu that most players probably didn't even know was there. This is very much a step forward from a UX perspective.
If you really just want to show and hide your helm twelve times a day for rp purposes, you could, I dunno, take it off? I'd wager the number of people who actually do that is minimal.