Something I had thought of a small while ago. Basically an in-game accessible menu, very similar to the Quick Starts, which gives a more convenient way to find out how something works, or refresh memory, etc. Potentially, units could also have a place and would draw their values and descriptions direct from the game files, instead of being exported to the wiki.
That also has the benefit of the unit pages updating themselves with each release.
There's a picture attached of a Quick Start category quickly rigged up, using some text from a wiki page I did recently, as an example.
Obviously it'd be better formatted and nicer looking than that.