Maybe I didn't explain it well enough.
The Back Button (BB) currently takes you back to the screen you were previously on, which is annoying as hell.
Say I'm on the Now Playing screen, go to the home screen to get into the settings menu and then go back to Now Playing screen. I then want to change the album I'm listening so I naturally press BB to navigate back through the folder structure, but doing so takes me back to the browser screen, thereby forcing me to go back into the folder list and scroll all the way back down to where I was before. This is just bad design.
Changing the BB behaviour so that it always navigates backwards through the folder structure from the now playing screen is how things should work and I believe the X5 firmware got this fix months ago.