not really.. You need to get the circuit board out of a usb2pc converter. There are components in there that you will need.
you need 3 things.
a snes joystick
a usb cable (any one will do), (you dont needs the sega one)
a usb2pc converter to hack apart.
if you have this Ill give you the schem/diagram
***update***
I read your first post again, I think I don't follow you. I thought you wanted to get a usb cable connected to the snes directly with out a converter. But now I'm thinking you want to connect the to joysticks together. That I don't follow, what do you want. Please explainer another way.