Diabolic Herb is not usable yet.
I changed berries names to make it easier to find after sorting. I can do the same with those few potions that are stronger than a normal version. Also a storeroom will be added in 0.14, it's something I'm currently working on.
I may do what you are suggesting with the description of the quests.
If it comes to increasing/decreasing likes... I can't really add imagine there, but I can add "+" and "-" if that's going to help with anything.