Maybe a little mod that equips tokens with a variable magnitude detect life enchantment on NPCs depending on chance and his mysticism skill could be a good complement to SDR then? I may do such a mod when I get Oblivion to work again.
That's the one; I never knew how it worked, but yeah it seems to mainly work on vampires for me. I don't think there's anything that makes NPC's actually cast a detect life spells. If you made something I'd love to try it out.