I've released a fixed version. There's now an EP1 set and an OB set. And now single-texture materials also emit detail props, not just the blends.
There are still two problems though:
1: in EP2 the detail sprites are screwed up. I'm getting help from a Valve guy on the Steam forums about it.
2: Mud01 should be emitting reed sprites. But there is sadly a limitation in Source where sprites will be clipped by the water plane.
So I have reeds turned off for Mud01 for the forseeable future. There's no point having reeds if Mud01 then can't be used near water. I envisioned it being used as a riverbed material first and foremost after all.