Automanage building units

[Hobart]

I'm playing England on M/M on my first time through. I'm doing OK, I think - esp thanks to Il Papa excommunicating France when they kept attacking me. Now I own a lot of French Territory. And the Milanese are going to get it too.

When I started the game I left checked the box for only being able to manage cities with a faction heir in them. Now I wish I didn't.

Every turn I save some florins (over a couple of thousands), my automanaged cities spend it on units I dont want! Like more ships, or ballistas. Rah.

Is there any way to stop this happening? Can I get these auto managed cities into line on fiscal policy - like letting me save up for a castle upgrade?

Thanks [edit for typos - oops]