My mod currently adds small spiders, rats and other small critters... but people been reporting that enemy actors (specially bandits) seems to target them for no apparent reason, even when the Non-Hostile actor is set as Coward and Non-Aggresive... it may have something to do with Bandits AI Aggresion set as "Aggresive and Very Aggresive" which forces them to attack Non-Aggresive Actors, i can prevent this by messing with Bandits Factions but i rather not... too messy and want to avoid future conflicts with other mods, any other way i could achieve this?

Just include those creature in a faction that is friend to some of the vanilla factions (bandit, vampire, draugr... basically any faction whose members attack you on sight). You may want to avoid making that faction friend to predator faction, if you want predators to attack them though.

Yeah... but thats exactly what i want to avoid, since messing too much with default factions would surely bring mod incompatibilities in the future.

No. You don't need to mess with vanilla factions. Just add a new faction, make that faction friend to the vanilla ones and assign that new faction to the new creatures.

Oh i see, this way i dont have to touch any vanilla faction... the only draw back i can think of doing what you suggest is an annoying Error when loading the mod in the CK because BanditFaction will not be set as friend of the new faction, hmmm actually it may be worth it, thanks!