Not so much expand as make more consistent. And yeah, remove the passage. It may be simpler to just leave your area without a coin because it isn't really suited to having a hidden part. If you want to try something though, you could make it so that the second room was technically possible without the Booster 0.8, and reward them with a coin for completing it so (if you want to keep the upward-boosting part just near the end, you can give it to them before that).
:| Thanks. Just thought I'd pop in to look at some stuff.
So much stuff going on. Someone just almost died so...
I'm trying to make something on my own time in CE. I wanna get back on here in before my birthday.
Hopefully will see you later. See ya :|