Its true! While its not in a convenient location on the select button, and you have to sit still, it made the difference. Also another great tip is don't chase down enemies if you don't have to. Just keep pushing forward. Especially in the latter levels as mini bosses appear, they wipe away any small fry enemies.
One other big tip: near the end of the game just after the large turret (that sprays missiles and fire at you) you'll meet Clarence Bodiker for the last time. When you shoot him down and collect the Cobra gun, save it! Use it against ED-209. Another cool tip; every 3 1/2 to 4 steps the large robot shoots his gun. So get right up into its face and blast away!
What else can I say. Robocop is one of Data East's best games on the Nintendo. Check it out, it really is a solid licence game. Good graphics, nice music and its not too long of a game either. Which for me, is a nice little bit sized robot treat.
18 more to go!