it is currently a gambit system, however the presettings is according to what SE deemed fit, SE has confirmed in multiple threads that each trust currently has a set of commands that they'll do with the priority being certain actions first with unity leaders having better AI's in comparison to normal trusts.The gambit system is why august will pop sentinel first instead of getting hate on target and why sometimes trusts won't use nott WS to refil their mp dispit their mp being nul and their tp being 3000 since thats considered a lower priority. Their priority whether to cast on specific members of the party like king of hearts chosing its master and itself or koru moru casting on everyone is how they are programed.

The explaination SE gave info on a few trusts to why some trusts couldn't be changed was they are set in accordance for their story's personality. King of hearts being a cardian considers itself and master as the only important beings as a example, they also mentioned they wanted trusts had to be used in different combination, such as some trusts WSing at any time (TenzenII), others closing SCs (Iroha II), some waiting for high tp before closing SCs (selh'teus except for AoE healing proc).

Personally as much as i want to beable to program trusts to do what i want, thats pretty much making another account except for free and they require no leveling since i can just make macros to get trusts to do what i want.