If anyone's interested by the c-stick feature you should definitly check this guide out: http://forums.mcleodgaming.com/viewtopic.php?f=4&t=42982
It's not perfect (you can get stuck, you'll see) so we can maybe find a better way to do it with xpadder advanced functions
Tested on my Luma3DS CFW (I used the HL method) and it works, but whenever I try to load a game after I launched input_loader it gets stuck on Nintendo3DS loading screen. Any fix?