Finally there is a way to customize the extended rom in the Titan. AnDim over at XDA made this tfat editor tool that works with the titan extrom images. I tested opening up an extended rom i had and it worked (previously nothing would). This will only work for creating an extended rom, making it into an nbh (with nbhgen or similar) and flashing it to an unlocked device. It will not edit the extrom on the device itself.
Check it out here:
http://forum.xda-developers.com/showthread.php?t=359327
I used it to create an Empty extrom as a test, this can be used as a base or just to flash to make sure you never get the "configuring your device in 3 seconds" popup after a hard reset.
You can get that on my section in the ftp here:
ftp://up.ppcgeeks.com/Titan/Users/Im...pty_extrom.rar
Enjoy!