I don't know if this is in the game or has been requested (I did check both and couldn't find anything)
I was thinking a poison mod, where you make poison from poisonous mushrooms, etc, and you can tip it on your weapons, arrows, spears, etc, and it does a little damage over time on enemies. I thought that would be immersive and interesting, and give a good use for the non-edible mushrooms.
Just a thought.