This thread stirs up a lot of questions about dwarven society, which will in the long run, affect gameplay quite a lot.
For example, how authoritarian are they, or how egalitarian? How are money and resources distributed? At the present time, here's what we know: Outposts start out largely communist; there's an "expedition leader" but this appears to be a job rather than a privilege. He has no extra authority over other dwarves. Even the mayor doesn't really have authority and hamlets stay pretty much communist all the time, with all dwarves taking what they need and (assuming other people play like me, squelching idleness at every chance) they work as much as they are able toward the good of the fort.
Then when the baron arrives, things change - suddenly dwarves have to earn their keep and pay in money; the baron has the power to issue orders and hand down sentences without appeal, other than the persuasive power of a bedroom full of magma. This just seems to continue.
What I'd gather from this is that dwarves tend toward egalitarianism, and they work that way in small groups, but that once there are more dwarves, a power structure begins to emerge which forces people to toe the line.
The way things are in the current version doesn't necessarily have to stay the same, but as it is, I'd say the idea of "lawyers" go against how things are done in large-scale dwarf society. The nobles more or less control things and toss around sentence and hammerings based on their whims; nobles like this don't seem like they would have room for a justice system.
Still it'll be interesting to see how these things get expanded on in future versions. Also, there's still the questions of, do dwarves LIKE having an authoritarian power structure, or do they seethe at the oppression of the proletariat?