What I would like:
Job Trait, gives 20% chance per merit to retain the extra finishing move you lose when you are 5/5 a step for a total of 100% at 5/5 merits.

Step effects: Adds 1% potency per merit to steps. Example: Feather Step gives 5% Crit Rate without AF3+2 feet, it would now give 10% before feet.

Violent Flourish Accuracy: Causes monsters that are normally unsusceptible to stun to be afflicted with Violent Flourish's additional effect. Increasing merits increases additional effect accuracy.

Waltz Potency (Just because SE already said they won't lower the recast, but dear god SE, if you're reading this, fucking lower the recast instead): 20% increase to HP healed per merit for a total of 100%.

Seduction Dance: Enmity + 25, Attack +10%, TP bonus +25, while mob is engaged to the DNC using this ability, the mob will receive a blind effect equivalent of -30 ACC. Mob may occasionally be intimidated. Each merit increases attack bonus and blind potency by 2%. Waltzes are unusable. Shares timer with Fan Dance. Saber Dance will stack.

Psalm Dance: Enmity -35, all damage dealt from the DNC will be reduced by 35%. DNC receives a large Subtle Blow bonus and may occasionally reduce the enemy's TP by 1-3 when striking. Waltz recasts are halved. Each merit increases the -enmity bonus by 2 and reduces the amount of damage the DNC deals by 1%. Saber Dance/Fan Dance do not stack.

Rainbow Step: Decreases a mob's magic defense by 12% for the initial step, and 3% for each merit afterwards. Cost: 10TP/step

Fire Dance: Grants a Raise and/or Reraise effect to the target selected. If person is revived using this ability, they will receive the effect of Reraise upon revival. Can be self targeted to inflict RR upon self. effect Recast: 10 mins, each merit reduces recast by 1 Min.

Just throwing out ideas, I know a lot of this stuff could be considered very overpowered.