I think it would be neat if Ranged DPS were the only class that could use partial limit break bars. Let's say they could trigger an LB that consumed 50% of a single LB bar dropping the total amount held by the party. This would remove all Debuffs including weakness and instantly fill the party's resources for TP and MP. It would be a setback in terms of DPS from using a Melee or Caster LB but could set the ship aright during a Rez fest when Healer LB 3 isn't available yet without ruining the chance to get an LB3 later. It would also be available before the first limit break bar is filled. Being able to remove Vulnerability Stacks that otherwise might wipe the party would be really interesting.