I've just done a Demon Crusher run and took SUS as soon as it was available to get the 4th mode for Underworld. However, it wasn't there when I started Underworld. If I play Necromancer's Return or replay a level with the ShadowHand, it is available
Is that a one-off bug or is that everyone's experience?
EDIT: Whoops! Sorry, Gniarf. Just re-read your post. You obviously did have it for Underworld. Must have been a bug for me.