I don't mod, let alone use the modding wiki, very often, but I do think more effort should be placed documenting existing game systems and how they work. E.g. if I want to extend some mechanic parts, or add some more advanced block functionality, I'd have to look into other sources or read the code itself to figure out what I'm doing. Aside from the generic 'creating entities/blocks' pages, I believe there should be more content on 'extending' existing game systems in their intended way.