You can change the size of the hotkey bar and make it pretty small. Do that and shove it vertically against the side of your screen behind your Duty list or whatever.



(They aren't actually in the position, I just put them there to demonstrate... Also, Auto-attack ftw)

1. 60%
2. 80%
3. 100%
4. 120%
5. 140%

I put them next to the menu when the menu is at its usual size. As you can see, the hotkey can be shrunk down to about the same size as the menu. My job-switching hotkeys are put vertically and put in the bottom right corner above said menu. Barely takes up any space. My Macro hotkeys (The 1, 2, 3, 4, 5 icons) are horizontal and between my HP/MP/TP bar and my menu.

Very hard to notice them taking up space. Not quite as good as a button to open the gear-list, but it's still handy.