I sent a ticket to the support and they said there is a chance that I will get banned for the use of 3rd-party programs (even though I specified I was talking about Wooxy and LVOC), and they also mentioned that Riot wants to encourage players to play on their country's server. So why not make all languages available in the first place (so people will not go creating 3rd-party programs to be able to play in English but have the voices e.g. in Japanese)?
Is there something you really can't do without in the client? Is Udyr displaying as a Picasso painting again? This is the place to report bugs and give suggestions for League of Legends in general!
Don't spam your suggestions or bug reports here, and follow the [Universal Rules](http://boards.euw.leagueoflegends.com/en/c/announcements-en/3eWpXbJi). While not every suggestion here will be implemented, your favourites can be voted to the top for maximum visibility!