The action of a beachcaster will be different to that of a jigging rod. Take a look at some of the jigging vids that @GPSguru posted on the slow jigging thread and you'll see what I mean. Those jigging rods are through-action, meaning they bend right down to the butt and the fish is played on the drag, not on the rod. I suspect that the top two thirds of a beachcaster wouldn't bend in the same way and wouldn't flick the jigs to get them working successfully.