The constant-turn descent is the way I fly all my circuits in the Pitts and Taylorcraft. Works a treat. It's especially common in taildraggers because keeping the runway off the nose allows you to actually see it during the descent - a straight in final approach masks the runway under the nose and you end up coming in blind. I hate straight in approaches with a taildragger. Doing it this way also encourages coming in with some slip in as well, increasing the visibility past the nose and giving you extremely good control of positioning and airspeed.
Pitts2112