I finally got SUM, my second DPS job to 90, and rearranged some of my keybindings to fit it's unique ability groupings. It worked well, until I switched back to NIN, and I find that several of my most-used actions were now unbound.

It seems to me that key bindings should be unique to each job.
This definitely reduces the appeal if leveling new jobs, since I'll have to put up with imperfect keybind setups for all but my main.

(For crafting and gathering, I just click the actions, since there's no need for speed.