I've thought about this a few times before.

I wonder if there should be an option added to hide the language chooser (especially if you only have one language anyway) , I know you can simply skin it out ;) , in fact I've added a quick article on doing this for 3.0. (as I have done for other versions at the time), but the same thing could be said for the skin chooser too, and there is an option to disallow anyone (easily, at least) choosing skins by hiding it.

I'm merely thinking along the lines of tidiness as with only one language present, it does not appear serve a real purpose as far as I can tell. :)

Agreed. If your forum is one language only this would help to make the skin look cleaner. Especially if you hide skin choices.