Eh, I figured these would be limited enough by not being allowed to leave a certain area rather than being controlled by an organic, they're pretty easy to just run away from and nuke from orbit then, if you don't want to deal with them but don't want their potential treasure.
The area restriction also outright prevents player characters, so I didn't see that being an issue.
Some general GM restrictions on them may not be a bad idea though, no just throwing them into an RP without there already being some reason as to why they're involved.