Well I've been working on a Metroid 1 remake in MMF2 for a few months now, and the engine came along great.
Only problem is that when I went to re-create Zebes the area became off-centered due to the way that Nintendo built the game. (This is a bigger problem than it sounds btw.)
Before this I used normal RTR scrolling but now I think that I'll actually need to emulate the way Metroid 1 scrolled.
Are you talking about the door system in Metroid? If you break it down, it's just:
1) fade out to black
2) door moves across the screen
3) load next frame
4) fade in
It's going to take a bit of code but I'm sure you can get it working with a little effort if you were able enough to emulate Metroid's engine. If you search the downloads or forums there might be an example.
That's not what I meant, I meant Metroid from the NES era.
Another problem with what you're explaining is that I'm re-creating Zebes all in one frame. (meaning Tourian, Brinstar, Norfair etc are all on the same map.)
Also NES Metroid didn't use the black fade in effect that the newer Metroids used, it just scrolled the screen to the next room when you went into a door. (I know that the solution is probably really easy but I can't figure it out.)