How this works:
Some rooms have special scrolling regions defined for them. Some scrolling regions have a breakable block that extends the region when the block is destroyed. If you can get past this block without breaking it, the screen will not scroll with you.
You can see how the scrolling regions for each of these rooms is set up here: http://imgur.com/a/bYAFB
The images are from MAGE, an editor for Metroid Fusion and Zero Mission that I created: http://forum.metroidconstruction.com/...