Ah.. the Old skool barefoot... I think the Ripper was the one who invented that.. Cant think of anyone earlier than him that did it..
I never had a X-2 but dont know why you couldn't barefoot from it!
I've done in on my old 650SX's, 750SX/SXI's and my current Superjet, and I do it on my XP too. You just jump off and commit around 50mph(looks best) and yes the glass helps.. A little regular chop is cool but any unregular wave pattern makes it looks like crap, you bounce all over hell and you can hurt yourself .
I jump right off to both feet then quicly go to 1 and raise my other leg as high as i can. Makes a huge spray! and is fun too.. I like to go into a huge power bulldog after a barefoot run. If you pansy around and lay your feet in the water slowly and dont really get all your weight into the water and on the support of your feet, throwing huge spray.. it looks gay IMO.
Fun trick.. once you grow the nads to jump off and commit.