Is there any way to ignore Shank's warnings and raid settlements anyway?

It's really annoying being told I can't set up certain settlements as outposts with no explanation why. I'd rather find out the hard way that there's a quest or companion there and reload my save than constantly be told now.

I've tried looking for mods that might help with this, but so far the closest I've found is SKK Workshop, which allows me to claim any settlement as an outpost. Cool if you want to take over The Castle, but I also want to establish some vassals too.