Pero como se crean madakafas!
No se puede hacer desde el cliente, creo que se hace con 1 mod o tocando los archivos de la carpeta del lol ni idea.
Riot specifically added a picking mode that allows this a while ago; I'm surprised that it's remained more or less undiscovered for this long. Internally, this mode is called GAME_CFG_BLIND_DUPE. While there's no way to activate this mode with the live client, it's quite easy as a developer (or if you simply mod the live client).
The mode works mostly as you'd expect: you can pick champions multiple times, and they're all playable in game. There are a few cool quirks though, like picking 10 Dravens and catching axes 
Here's me using it:
Champion select: http://i.imgur.com/ThsYRPj.png
In Game: http://i.imgur.com/IC5PJo7.png
If you want to use this yourself, keep an eye out on Reddit (or, it might be easier to follow @astralfoxy). Sweet Stuff is arriving next week, and I think you'll freaking love what you see.
EDIT: Check back in an hour, either here or at Twitter. I'm working on a mod right now to let you guys enjoy this new picking mode.
Estan baneando los canales de twich que lo stremean, yo paso de jugar no se que caiga un ban fresco
