Sooooo about Backer ID's... we actually have a group one for our Forum that can be used at start-up.
I'm not sure if this is the same as what you're asking for, but I figured I'd share this tidbit to people who are just starting the game.
If you use it, you get a special little item when you start the game.
Please PM me to get the code, though if you're an oldschool person from this forum, and you know what we're called, you probably already know what the code is.
NOTE: I am told it works only in a New Game.
Instructions below:
1) At the title screen, press any button.
2) Start a new game and select any of the New Data slots.
3) Name entry should pop up. Delete the default "Miriam" and enter the code instead (I believe it's in all caps). Heh heh heh...
4) If it succeeds, a specific sound effect will play.
5) Continue to select the difficulty level.
6) The game will start with the unlocked item inside of your inventory.Your file’s name can be changed afterwards during the game, but your in-game item can only be unlocked when starting a new game.