Pat Austin is a modern shrub rose which does bloom on old and new wood. It's pretty much like a floppier Hybrid Tea, or shorter climber. In Southern California, it grows like a pillar rose, a shorter climber. You may prune it harder to keep it more bushy, or you may train it like a climber, shortening the laterals it produces as you would any other climber. Usually, here, the larger you allow it to grow, the more bloom you will have.