I'll take a fourth option and say I want a sphere grid that goes along with the leveling. Mostly. You get a sphere let's saaay from level 10 onward for each fifth level. If it is shared between jobs you'll get it when you reach a level first with any class/jobb.
If you want to spice things up, make some special "talents" only unlockable with special spheres that you get from playing content related to it. Like a trait that increases the chance of getting a triple triad card for winning a lot of rounds. Or something related to each beast tribe, for maxing their reputation. Or something for the raiders to brag about if they clear a savage raid before the next patch.
