Divine Divinity had a couple sparing sessions where you could get experience, in one case with a skill as a reward if you won, but they were one time events. There were also objects and books that could give you experience or skills (ie a set of 3 books on trading that would teach a bartering skill if you found and read all of them), and a couple 'lessons from masters' (experience and spells from quest reward). D:OS may contain similar things.
