I manually control my party as well and play on Active mode. Like you, I only use Gambits for buffs, emergency healing and some pre-strategy and beyond that its all me baby.
The problem here is that Yiazmat has so much damn hp that it takes hours to kill him and since his strategy only has a few minor changes you end up repeating the same actions over and over again for hours... That to me is tedious and not fun. The game is practically telling you to just set up your gambits to play themselves and go out and watch a movie. Yiazmat was fun the first few hours but after awhile the whole thing seemed tedious and boring and when that happens, you did something wrong. This is coming from a guy who actually enjoys grinding for crying out loud.
I don't mind having to battle for awhile if its intense but after a few hours, even the most disastrous attacks he pulls feel routine. Throw in the fact you can leave in the middle of the fight and restore your health (and sanity) and I feel the bosses threat level is significantly depleted. The Shadow Seer was an intense battle, the King Behemoth was an intense battle. Yiazmat felt like a chore...
No there isn't and believe me, it does matter, as mini takes out the usefulness of your physical fighters and allows most of his spells to one shot you. Its pretty annoying. I probably could be Ozma if I wasn't hell bent on stealing his rare items and just focused on killing him. Using Quina would also probably help. :rolleyes2And there's no protection for mini in IX? Crazy, I totally thought there was but I never went into any kind of status attacks or protection. The only thing I always protect against is Death.