Very good points. :)
also, a add on o what ShadowninjaNick said, if the OW gets all the SMW original stuff on it as you progress like the hills at the right of yoshi island on the original, erase the original events, that way this doesn't happen.
to erase, go to the hill with the light thing on it and press up( the ^ button) then click the left button on the mouse and drag it over all the paths, then press delete on the keyboard. There you go.
Any more questions about The OW, tell us.