I hope this doesn't bloat it to much that it won't fit on an 800K floppy! It's close just now, adding a lot of stuff for a feature I expect only a very tiny fraction of people would use. And talking of floppies, a self-extracting version would be very useful - this is a machine bootstrapper tool after all. (moon, stick).
One thing I always have to grub around with is enabling the HDMI 'overscan' in the pi config so that the image is the correct size.
To me, this "feature" is just a bug - so a checkbox for that would be useful IMO.
(I could also mention 60Hz/4K option too, but I may be the only fool that uses that - RISC OS desktop at true 4K on a big monitor is "hilarious")
Will test MassFS on Unipod and A9, though IIRC last time I played with this I had issues finding a USB drive small enough that it'd cope with.