* It would be interesting if the user could highlight a noble and hit (o) to (o)verthrow them. Of course, if this occured unsuccessfully, the player might face the hammerer's wrath.
I'm all for immersive gameplay, but this goes a bit too far.

Seriously, it would be a good thing if nobles were a bit more effective in enforcing their demands. Seizing goods is good - you can always make new stuff. Giving the only armorer in the fortress -effectively- a death sentence because the noble really wants gauntlets, is counterproductive. Dragging him to the forge with a guard on both sides until it's finished, is better. The best would be if the armorer in question actually cared whether the noble demanded something (for fear of fines/eviction/demotion/..), and actually hurried up production because of it. Right now punishments for unmet demands are just random violence.
Which brings me to an important point: nobles don't terrorize their subjects without consequences. They fulfill functions: they are placeholders for the king and as such they organize and lead the defense, exert justice and protect the wellfare of the land and the economy. The populace in turn serves in the military, abide by the law and pays taxes. If the noble doesn't fulfill his part of the deal, they don't. And it's always possible to appeal to higher authority, in this case the king, to remove the offending noble. Nobles that act like a blood-sucking parasite exist, but they are rare, and don't last long.