whatever works i guess. It isn't really all that hard to do it without the claw, so i'd suggest not using it, but do whatever's comfortable. Just note that i can do every fox flashy technique, and i don't claw.
Plus Hylian, don't you use a thumb & finger on the control stick too or something?
Whatever, just do it how you want to, and it'll come.
EDIT:
http://www.teamarlington.net/archives/343 5th row 3rd column, that's mew2king on the far right.... if you enlarge the picture you can see he's using the claw... I don't know if the claw helps for multishining, but I don't know that many people who use it because it can be awkward for some. I guess being able to push X with your index and B with your thumb would be advantageous but I know of plenty of people (like myself) who can multishine with their thumb just fine by sliding from Y to B and even from X to B.
too bad that picture isn't 3rd row 5th Column...
(if you don't get that check the sig)
yeah, i multishine easily w/ y&b, and i don't just jc shine for multishining, actually, multishining is the least useful use for a jc shine.