So, I playtested humans for a few hours, and I have some thoughts...
Stonecrafting levels up astonishingly quickly on the brick-splitting block. After less than a year, an untrained, unguilded human nearly hit legendary.
I haven't tested with all of them, but the Dwarven Merchant stall at least is bugged. If you select "rent to dwarves (year)" your human will bring a license over, which will disappear and be replaced by a big pile of gold.
Finally, your liason offers to make your town a Barony remarkably quickly. Again, within the first year or so. I'm a hamlet barony.
I have some other observations, but it's 3:00 AM here and my brain is fried.