A.) No cussing
B.) I think with Riivolution
Yes, Riivolution CAN, infact load hacks from a USB Device. I have tried it myself a while ago, and to be honest, screw the 2GB SD Card, I got a 4GB Flash Drive, almost full with ONLY Brawl Custom Content. I have each character COMPLETELY replaced with outfits and stuff, and I have a custom CSS that I made, complete with CSP's for EVERY Character, and EVRY slot. Every character has a custom CSS Icon, and Custom names. It's SO not even Brawl anymore.....
Brawl-X FTW (my custom unreleased version of brawl)