Fix SMN as a pet job.
Add BST as a pet job.
Faster acquisition of job abilities (as in, you get 90% of them by level 30) that all scale up appropriate to your level. Traits can augment them further, but give us the playability. Nothing annoys me more than losing half my buttons (or worse, having like 2 buttons in Toto-Rak) just because I'm down-sync'd.
Un-f*** DRK. Yeah, SE really messed up with that one. It didn't really need a lot of changes to begin with, but I'd rather see DRK with defensive cooldowns that use MP, so they have to decide whether to up their DPS or their mitigation (or a mix of the two). Mana management was one of the main things that made DRK interesting in 3.x.