If there's a simple cheat code to either free-fly around the stage (like the debug modes in the original Sonic games), or at least one to change the location of the "camera", that'd be good. I think the latter one would be better, if it's possible since I could have the screen at the very top left corner, take a screenshot, then move the screen not quite a screen to the right, to leave a small bit overlapping, so that it's easier to stitch, and keep going to the very right of that particular stage, and then continue, but roughly one screen below, etc (which is pretty obvious). Although the "free-fly" type code would be just as useful, I think.
The "You still need cheat codes" in your post, seems to imply that you have something of interest <_<, well it'd be a bit odd if someone was to say something like "You still need cheat codes"? "Yes", "Well I haven't got any"