Well i'm not fully clear on if you mean a permanent buff like from melding materia or a temporary buff like food. Now I don't personally think it would be a good permanent buff as like the other poster said because materia is finally making more head way, n I think materia should play a larger or more less gated by instance role in the game. But I think an enchanting scroll with a longer duration more like the company actions, with attribute or skill buffs increased more then food n pots, would make a good addition especially if they were dropped only from certain content, say aqua and raids.