It depends on the severity. I have a roarer that I wouldn't consider doing cross country with. It'd be too much for him. He had tie-forward and tie-back surgeries when he was younger to "fix" the problem and get him to the track, but neither worked.
Remember, too, you can't do hunters with a roarer. This guy was doing 3'6", but he was too loud for the show ring Actually, that was good for me, because his owners gave him to me as a husband horse. He's wonderful for that.