Well, I'd say MM2 where the moving platform segments are,where the ladders have a platform. just stand in front of them and tap the up button on the D-pad. that's what I figured out.
Gravity stages should never have ladders in a segment when your upside down for the most part, I remember that you have to press the d pad in the oppisite direction where the origional button was supposed to be.
Then you'll have gusts of wind, which is another problem, this is also presented in MM2, in the form of Airman and his lackeys. that would take awhile, but it's worth it if someone wants to create a stage that involves strong gusts of wind.
The "Warning" is just a little gimmick found in X, Zero, and ZX. they seem not to appear anywhere else other than eye candy before you fight the boss. Besides, you are making the classic series MM engine, right?