Wide scan would be lovely, as would our own version of occult acumen... but I think SE decided against giving us that because it would be too over-powered. Even at 1-2 TP per spell, it's still pretty ridiculous considering most of our spells are so quick to cast.

I would also love reduced costs for existing job trait combinations. Most notably, Fast Cast and Conserve MP (or at least give us spells that are actually relevant to us for these traits). Would love to see Counter get some new spells to combine with it. Enervation is one of the most useless spells BLUs have.