It seems that this change (at least sometimes) results in some undesirable behaviors, like the AI building too many of those units. My friend who's using this mod told me that in his game one of the AIs built like 50 hoshikos.
If it was solely due to AntiMine, the alternative would have been the AI building 50 scout frigates; not exactly the rosiest of situations either way. It's not something I've ever seen before, but it might be because the AI doesn't use as many mines as some human players might. I'll probably spread the frigateRoleType out in the next versions if the AI does actually heavily favor this frigateRoleType in certain situations.
So far, my old playerAISharedDef observations have held up. The playerAITable values definitely increase both build list size and how often build lists change, signalling that the AI does indeed use those values for updating its build lists. The values do not seem to affect which build lists get focus; however, since larger values mean larger build lists, when a category does get focus, an AI with a higher playerAITable value in the category will build more items from that category than if it had a lower value.
Currently mucking about with missions, as in the missions the AI gives itself to complete. Sure, I can't add any new missions, but I can still change the missionType of a mission to that of another one while keeping the .entity file's name. I don't know whether the AI recognizes the old mission .entity or simply ignores it due to mission .entity files containing duplicate missionType values; if it's the former, I'm golden, but if it's the latter, then my redirect attempts won't work.
EDIT: Yup, it's the first one. Redirected the AttackPlanet mission to the Explore mission, now the AI is trying to clear its asteroid with 12 scouts. Too bad there are only 9 missions to play with, 8 if you don't want to rely on a flagship.
EDIT #2: Some missionTypes are more equal than others. If you redirect certain missions to certain other missions, the AI will bug out and not know what to do. A nasty side effect is that its mission queue keeps growing, meaning you'll get ungodly lag within a few minutes of gameplay.