You mean a good old H-28 with a stern-hung rudder, like this?:
Google Image Result for http://h28oldsite.blogsite.org/images/ketch2.jpg
So with an offset prob, you'll get effective rudder-based steering with a "kick ahead" on the throttle on only one side, the side the prop's on, right?
So you do have more maneuvering problems in reverse (or in forward when you have little hull speed and rudder flow) than the 'average bear', no?
I think you're right--practice, practice. And if there's a direction she "just won't swing" in close quarters or crosswind and where dock lines are near, use one of them, and a fendered piling of dock corner if you have one, as a spring line to induce swing.