I'm going to go through your questions one at a time. For me, I've never had any kind of leakage. Could it have been that he thought he was passing gas and wasn't? If I'm reading your post correctly, if he takes the stool softener and laculose he has between 2 and 4 BM's a week? If that's the case, I think that's great! The stool softener and lactulose can be taken longterm and will hopefully continue working for him. Also, if he's like the normal teenager, he probably doesn't get enough water. Another thing you might want to try is FiberSure or something similar. Most kids don't eat enough fiber and that might help him without making his BM's too loose.