When reaching max level on a thrall, I would conduct a re-rolling ritual with Elixir of Rebirth, stripping them naked and having them kneel on a pillow in the prayer/worship position while feeding them the elixir.
But now with crafting thralls they just get up and walk away.
Such impudence!!
Anyway, how about a toggle on crafting thralls so you can exclude them from Living Settlements? That way you can position them on a station or guarding or whatever and they stay there? It could be a “Stay” command in their menu or a checkbox toggle on their inventory screen.
They’re our thralls, so they should obey us! xD