I love that idea.
And while we're at it, I use a controller and my ability bar vanishes on e I stop holding R2 (so I can see more outside of combat).

I would like to add an actual hotbar for skills that are essential for my current job so I can see at a glance what I have at my disposal but there is no option to make that hotbar go away outside of combat and I really don't want that thing visible all the time.