I think this is pretty interesting. Could morph this into a prison overhaul, with a new map section (like kingdom or sitland) but its a large prison yard.
Could add prison guard jobs, a warden job, and what you're saying, a judge gabe overhaul where he can have a trial for people put into prison.
Extend prison times based on bounty, or severity of crime, but add fun things to do in prison, like ways to escape, work for freedom, and a very long prison sentence for murder, which would also lessen RDM on the server due to being punished in a RP way for it.
Could turn out to be very buggy, but if done right and debugged i believe it would be a very fun thing to add to the server