This is more job gifts than points but for all jobs I think they should get +10 max category 1&2 merits.

THF: bully gives killer effects +1% per job point
NIN: Migiwari threshold reduced 0.5% per job point and maybe a gift that makes Migiwari work twice per casting
DRG: Percentage of hp for steady wing increased by 2% per job point
DRK: Absorb Potency +1% and duration +2 per job point

I also agree with making higher levels of TH more useful, but if they do that they should also make them more reasonable to obtain. I recently merited feint back to 5/5 but still can't manage to get to TH 13.