There are two kind of people on this forum: mappers and everybody else. As someone who does not map at all and generally lacks in creativity I sometimes fantasize about the mission I'd do if I was up to it.
It would be probably about an illegal alien who because of his legal status has to avoid all contacts with city watch. I'd call the series (heck, let's make it a beautiful bigly series) "Thuggin'". The player would visit shops and residences at night and beat (with a blackjack) merchants who refuse to pay for protection to player's boss. Maybe instigate a street riot, break into a inventor guild shop and steal some
TVs music boxes. Raid the rival gang outpost and steal their smuggling shipment, then burn the premise. Infiltrate a rich neighborhood and kidnap a justice servant's wife.
Gameplay wise player could leg-kick AI from balconies/roofs, look around while picking locks, smell loot with his 6th feeling. At the loot would be _very_ scarce. AI would not be able to lock doors after player pickpockets their keys (or open them for that matter). No invisible AI master keys ever.
Lock picking is fun but what about lock breaking? I'd have some.
Does it sound like GTA medieval edition? Maybe, but I didn't play GTA to know for sure.
If you ever had an idea and regretted you couldn't map or even hit the engine limitations that made you feel short of original design, time to post here.