I don't think Larian is into that. However, if it was added, I think we need to worry about XP. I don't think it is fun to max out level, but you can max out by the start of act 3. Maybe that's the design intention; I don't know. If you add additional encounters (with additional xp) I think you also need to slow down xp progression. If I had the option, I would slow it down already to avoid reaching max level too early.