Iām struggling with words, sorry if its a bit incoherent. 
I find it odd that someone who has spend time on becoming a master masons has no benefit over an untrained person when he becomes another class.
It might be interesting to have the perks of classes flow over in a new job. Imagine that if you change some ones job they would keep 50% of the bonuses they had from any retired job. So a ex master farmer turned to soldier would still move faster. A crafts man (potter mason etc) gets a lot of hp from levelling up, those would make good soldiers too or new farmers/trappers.
I am not asking for a dwarffortress mix and match skills, but just a little background and development of the people under the players banner.