Right now, a Judge can fine a noble for misbehaving. This isn't actually a punishment on the noble, as he can then just turn around and ask for funds, so that he can keep his men paid. If he doesn't get the money, he'll probably lose his unit and have to wait for next tax day. So either the Lords and Dukes end up footing the bill for him, or the General gets punished instead with a slightly smaller army. Either way, it's not a big deal to anyone involved, and the offender's biggest punishment is possibly a few days of boredom.
I'd like to see the Judge being able to hand down punishments that players would actually want to avoid. Maybe this means making you pay for fines out of your family gold. Maybe this means the Judge can make you lose honor/prestige as well.
Thoughts?
