Just an idea, could a new search be added to the codex which allows you to search for the function.
i.e if you want to know the arguments for wp_list_pages you'd just search the function and find it,
Right now I find Codex a nightmare for finding simple things about functions, I search for a function typing in it's full name and the result I actually want is on the 4th page of results! The same applies for this forum search.
Thanks for reading this,