Give each job their own unique Level 1 and Level 2 Limit Break animations, for example:

Dragoon:
Level 1: High Jump
Level 2: Penta Thrust

Monk:
Level 1: Dolphin Blow
Level 2: Phantom Rush

Samurai:
Level 1: Dispatch
Level 2: Iainuki

Ninja:
Level 1: Sange
Level 2: Mikage

Red Mage:
Level 1: Diaga
Level 2: Meltdown

Summoner:
Level 1: Judgement Bolt
Level 2: Tidal Wave

Classes keep the current generic LB1s and 2s. But this at least adds flair, so that we don't have MNKs using a buster sword during their LB and such.