Those longer returns are really rare. Smith's problem was never kick coverage. I mean RGIII throws interceptions, too, but I'm not going to call him a pick machine when he only throws five in a season (got damn we're lucky!).
Smith's problem has ALWAYS been the kicking game. Blocked kicks, missed kicks, bad kicker selection, and so on. Returns could be better, but, well, Banks sucks and I blame everything, swine flu included, on Banks.
Like Bang said, he nailed the Forbaith pick-up.