Skate. Idea for gameplay improvements

The idea of sharing quests in co-op challanges is great, because when I'm stuck on something my friend can help me, but sometimes i didn't even try and he finished whole challange and I can't even try. It would be great improvement to have possibility to skip the challange by pressing something if my friend did all quests, but also have the possibility to finish every quests for my own even when he did them.