Hello, Actually, I think there is one way. I looked for a non-melee skill, and I remembered the tattered bowman. If you check it in the monster file, you can see "Auto Level Scheme: 89". So I guess you can add them skills by adding them a scheme which contain that skills.
Thank you! I shall try it. I remember asking before some time ago and no one seemed to think it could be done so I am relieved there is a way now.