Console Variables

[MoonWitch]

Not sure if this fits in here; but I trust someone will place it in the better suitable category if needed

I've tried to find a conclusive list of all console variables - but most aren't up to date.
(http://wowpedia.org/Console_variables/Complete_list)
(http://wowprogramming.com/docs/cvars)

How are these "mined"? It may be a stupid question; if so I do apologise. Most that are accessible through the actual in game options - change all the options and check your Config.WTF. But I've noticed quite a few not being triggered by doing that. So how do these lists come into existence? Trial and error?