Now the crowning glory to this new ini file would be if it could be edited from the player GUI without having to connect it to a computer but I don't see how that could be made possible
Maybe if I could learn how to make and compile a simple Linux app for ARMv7 (like these players' SoC are using), it's probably possible to replace the test mode app with an app which would allow changing these settings.
It could prove pretty difficult to make, having the app interact with the player's buttons and stuff... I don't know, we shall see.
Interesting thing - I found again a reference in the firmware to some unreleased model, NW-WM1C. There is NW-WM1, NW-WM1C, and NW-A30 Series.