Yeah, they should be able to send seiges as well. Restricting their locations is a great idea! I just changed their settlement biomes, but it'll take generating a new world for it to have an effect. One of my long-term goals is to also make them playable, but I'm focusing on refining the mod first.

yeah maybe set their biome / region to coastal

Love this concept, but now it's got me wanting additional complexity... like limiting their outposts to regions adjacent to water sources, for example.

Can they send sieges too?

Wow awesome! I'm sure no one will do anything cruel or unusual to these gorgeous creatures :^)