I wouldn't say "a lot", but there are some prefabs where no sleeper seem to spawn.
In Vanillaprefabs the sleeper spawning works as expected. I guess some of the custom prefabs used by the mod simply don't have sleeper volumes placed (or they are broken).
I recently moved into a mid to big-size villa. I haven't seen one sleeper there when i first discovered the prefab and haven't seen yet a single sleeper after 2 weeks of living there, even not when we accidentally removed the protecting sleeping bag. Anyway just the sleeping bag would not cover the whole prefab.
I can post screenshots of this prefab when we continue playing next time.
But i like it anyway. Since there is no really working protection against sleepers besides the bedroll, there are at least some prefabs where they won't spawn.
I guess he means skills listet in the skill list, but just showing "NA" instead of how much skillpoints the skill should cost. Skills you can't buy for skillpoints, but you get by reading class papers (or complete skill quests?).
I think he wants to know how to craft the class papers which make you able to gain these skills.