Unknown - Alpha?

[Neelke]

Killings in Altstadt (Conversion Mod) They use thalers more than any cs ive seen. You will understand once you play the mod.

White Night (Conversion Mod) OR Penumbra Necrologue (Demo) These two uses infected enemies. I believe Penumbra Necrologues enemy is the only one where the enemy says things like in Penumbra BP.

There's no mod (not what I recall) uses something as completion procent.

There are many custom stories that uses sanity potions. If you want a good one, I would recommend The Great Work. However, there sanity potion is called Paregoric.

Not played a custom story or conversion mod with different door sound. But Closure (Coming May) seems to be using custom opening sounds.