I like the idea of more crystals. But letting them drop in beastmen zones, and only when this kupo power is active, wont impact crystal availability at all. (and as for farming them in sky, that doesn't help new or low lvl players much) (altering it to current crystal drops are tripled, now that would be nice!)
Double food duration is nice to. But along the same lines, i don't think it will be all that effective. If we still had a majority Man pt system, then yes this would be great. But most leveling is either solo low lvl (where food not really needed), GoV parties with 18 ppl in which case food really isn't needed, or abyssea for mid-high lvl players where kupo powers don't effect players. Now their are some areas this would be nice. But as a whole, its effect would be quite limited.
Double conquest points and town item supply, i can argue against them. Even if limited, they would be helpful.