Item-using abilities are already ridiculously overpowered in the Dungeon (can't be silenced, don't deplete MP resources, great versatility), making them nearly unlimited just because the items are storebought is just too much for me. 10 uses of items per floor is pretty generous, I think.
Terra's healing isn't that great at this stage (not horrible, but not 80% like Heal). Mia -could- make it, I'm not entirely sure, but I'm leaning no.
-Djinn