I thought I would never see the day... BF2 made a post that didn't involve MP.
Back on topic.
In my opinion, your idea is great. Possible? Yes. Probable? Maybe. Likely? Not very.
It would be great to have some of your units stay behind in a tavern or something, where they could train by them selves, while you go out and about, doing errands for the king. However, this isn't really top priority. Right now, the dev team is focusing more on fixing bugs, glitches, releasing the mod tools, and adding new features to be worrying about a place where you can stash your extra troops.
Personaly, I think its an awesome idea. But realisticaly, it won't happen any time soon.
Unless Armagan says it will.