At the moment they are on the buff button. I dont really like that and am planning on splitting out the combat buffs from the longer term buffs. These and similar items really function more like potions and stones and can get used every 2 minutes in boss fights etc.
No, I meant When I am setting up a custom button, what Category would they be under? I have all items on that specific cooldown (managems, healthstones, etc.) on one button.