Ouuuuum
Quote from Zeke:
By the way, should I already know how you're making the Speed Booster do that, or is it new?
It's not something I discovered myself if that's what ya mean. I'm not sure how long the info's been around, but Deep_Space_Observer and Rakki were the ones who provided the values. All in all, a grand total of 4 bytes were changed; 2 to allow Samus to keep her speed after jumping and another 2 to keep it after falling.
As for the doors not being very obvious... sorry! I like 'em that way. If it's any consolation, they'll always be ground-level as seen in the video (and only in that area), so they won't be hard to find.