About leveling up:<br/>To me, Sorcerer should get her spells from short rest, compared to Wizards that need to study up. What comes to skills, why not allow raising skills that you have used actively in the given adventure, but if raising "new" skills, there should be some sort of practice period. Feats should be case-to-case, like Toughness and dodge could be taken from the fly, where Skill Focus/Meta magic feats/what nots should be trained by self or finding an mentor.