Do you know why the decision to make frigates obsolete was taken?
I don't know. I don't think it is related to the AI. But I'm not willing to make gameplay changes to make frigates more useful, so it's probably best to also leave them to obsolete.
May I ask which resolutions you removed? I did not notice which ones were missing.
"Assign City", like the UN resolution in vanilla BtS, was theoretically available to the overcouncil, although it could never be chosen (I forgot why exactly, but I believe it had to do how membership and semi-membership works in vanilla BtS as opposed to FfH).
"Pacifism" was obviously unfinished, as it literally didn't do anything and was not selectable. Whatever it was supposed to do, it probably wouldn't fit FfH.
The only thing that might have been visible earlier was the "No city razing" resolution, which I deemed unfitting for FfH (besides, it seemed unfinished, since it only prevented auto-razing of cities).
I think there is some more potential in the vote system. I added some possibilities to implement vote effects and AI in python, so maybe Magister will implement (or already has?) some more interesting resolution in his mod. I think he was planning to do that at some point. In ExtraModMod, there currently seems to be an imbalance between good and evil AI civs (the latter seem stronger for the AI), so I might try to implement some overcouncil resolutions to get the good AI civs to work together.
I'm not categorically against adding new resolutions to MNAI, too, btw. So, if you have an interesting and not too complicated suggestion, feel free to post them here. But, unfortunately, the giant pile of unfixed bugs is arguably more important than this stuff, so I don't know if I'll ever get to it.