Actually the AI knows damn well what to do when Capital Planet Victory is enabled. At least on Cruel and Vicious difficulty (Some of them instantly rushed my Capital planet, completely ignoring my more forward planets). The AI still needs some tweaks, though, I admit that.

As to your original statement about the Armistice spam on Akkan class Battlecruisers: The autocast just needs to be fixed on this ability. The AI uses it instantly when rushing an enemy gravity well, which is just completely pointless. The level 6 superability of the Marza class Dreadnaught needs to be fixed as well by the way, since those things still seem to use it even when there are no enemy ships near the dreadnaught, like they did in Sins Trinity.

So yeah, you are right about the spamming problem of Akkans. Good catch!

Yeah, I noticed this too.  An inferior (but heavily cap-shipped) AI fleet jumped into a fortified gravity well, containing my entire attack fleet, and started spamming Armistice like there was no tomorrow.  Very annoying -- IMO, it shouldn't even be possible to do this.

Anyway, I finally broke the stalemate by moving everything in the fleet except the Titan to an adjacent well.  This apparently convinced the AI that it wasn't outnumbered any more (arguably also a bug), so it stopped casting Armistice and tried to fight.  My Titan and the adjacent fully upgraded starbase were able to kill off the Akkans, and then I jumped the rest of my fleet in and crushed the AI's ships before they could get away.