Hori Wireless Tekken 6 stick question.

I know i can daisy chain the buttons for ground. but can i also do this for the stick too?

Yes

DS is the man.

had another question. I desoldered the board holding in the buttons. then i also grinded down the tabs. but my buttons still wont fit. i just bought some standard obsf30s. i also grinded the little tabs on the buttons too. the holes seem to small. did the holes needed to be widened too? if so, how would you go about doing that?

I just used a hand file when I modded that stick. You could also use a dremel to sand it down, keep test fitting and move on to the next hole. Eventually each whole holy-hole will accommodate your OBFS30s.