I agree with phillybaby about the loops and rolls. Usually on the first flight (depending on the student of course) I have them do a loop and attempt a roll (some trainers don't roll too well). This lets them get a feel for the "range" of control they have where just flying a circuit doesn't. After a while I make them take the plane up a little higher and tell them to move the sticks however they want to see what it does and then have them recover.

Another thing I tell students is not to move the stick but to put pressure on the stick. I think this gives them more feel and keeps them from banging the sticks.

Even with the BB I will occasionally reach over grab the stick to show them the control movements with their finger still on it. So it is possible to use a combination of the two methods