Yeah, Daimao (Steve Simmons, a meraber of our forum) uses cursing in the subs for the stuff he's done. I think the 'worst' he's ever used is a "Holy sh---!!" from Cell when Vegeta fires off his Final Flash, and even then I think it's a "Shimatta!" moment so it makes sense. Otherwise it's pretty pedestrian stuff ('kuso' and 'chikushou' are treated as variations of 'damn' and 'damn it', yarou as 'bastard', etc. etc.). I think my favorite line from the subs is "[Kakarrot] is one throughly annoying bastard" or some such.
As for Clyde Mandelin (Mato) I haven't seen the Dragon Ball subs he's done, so I'm not sure.