yeah... with the whole henry gale escaping thing, two women getting shot and our boys getting taken by the others i dont think he had much time to get sayid to do that.. ( rewire the terminal or whatever. ) besides he was going head to head with ecko about the button after Henry gale lied yet again...

Also when they hotwired the hatch in the end of the season to keep Ecko out. the blacklights didnt come on, so there is no telling what would need to be done to get them to work again. we dont know what henry Gale did when locke was trapped under the door.

Sayid was doing other sayid things... and maybe they didnt need him in the hatch with Charlie and desmond aswell... too many cooks in the kitchen obviously... as it imploded.

besides it took TONS of Proding to get Sayid to Help Hurly with his Radio idea.. so sayid isnt the most easy guy to get to help with things. he seems to have a richeousness about him at times when people need his technical help.