nope it might even help them. In High Flyers, many people don't like feathers on the legs because of the extra weight and its harder to fly high with feathers on their feet, but for rollers, I don't think it'll matter
Little John, whats up? concerning the muffs, it may or may not be a dominate trait in the Jac's. It can become dominate in a strain of any family if you want to make it that. If you follow the roll in a family and the majority of birds that you use happen to be feather footed that will become dominate. You could also follow the roll in a family and breed away from it and it could become a ressesive trait. If you want to breed the best performers you have to breed for the performance and not really breed for the muffs or away from them. jmo.