I can see acceloration being quite useful to the MCH as a good part of their dps comes from weaving in abilities in between skills. Also would help give them ammunition more often.

As for ardor it sounds like DET (just without buffing dots and auto) and for that I don't think it needs to be added. If anything they just need to make DET more useful. Currently I see no use in DET as I see no change in my dps by increasing it and I should know I put Grade 5 DET materia in most of my materia slots just to see if it would raise my dps. I believe I raised my DET over 100 point and I saw no difference between my damage from 600DET to 700DET. I even checked on my AST and SCH who because I was using their af2 gears had different DET stats. I believe my SCH had over 100 more DET compared to my AST and their heals were identical. Now I only put DET on gear once I've reach my Crit limit because all the threads say it's useful. How idk?