FYI, you don't need to spam new Foothills instances just to break someone out of prison so that an encounter can generate. In 3.8.0, we changed it so that Betrayal encounters can fall back to jobless or even imprisoned members where necessary, instead of just being unable to generate the encounter.
If it pulls someone out of prison, it will grant you all of their pending intelligence at once, so you don't lose out, however it cannot pull someone out of prison if it would max out the intelligence for that job, because that wouldn't actually let the encounter generate.