Is it possible to 'seed' provinces with rebel armies? To represent communities of people not yet 'under control'?

Or would they move away? In which case would putting them in a rebel fort prevent them from wandering?

Such 'rebels' would be useful to slow down a players and AI progress as they have more enemies to eliminate and could block mountain passes in the Italian Alps etc which people traditionally avoided due to the reputation of the inhabitants.

Cheers,

Quilts