Um, not meaning anything rude here, but I see a breach here for hackers(Hack disrupts everything). If Everyone can go and see the naughty players in Jail through one entry point, then there's a chance for them to get out through a wall-walking hack which only admins have if they're hackers.
Suggested solutions : I think there should be an admin in the Jail during that time or only visiting them when an admin permits and teleports them to the Jail.
Besides this, the other ideas are great  |
You can easily prevent this with a little GS2 Magic
The solution I had for this in my jail was a temporary, maybe not efficient but certainly effective door that only warped players who were not jailed through. Upon a jailed member touching the door their time increased by an hour and they got warped straight back into the centre.