Anyone that has root, have you checked to see if the bootloader is unlocked?
**WARNING, I HAVE NO CLUE IF TRYING TO INSTALL CWM WILL BRICK THE PHONE, THIS HAS NOT BEEN TESTED!**
If its anything like the Optimus 2x then you just install Clockwork Recovery and hold the power and volume down buttons from a cold boot until you are in recovery mode (can take up to 10 seconds). If you get into recovery then its unlocked. If CWM does not install correctly or the button combo on power up does not work then we will know its either locked or we will need a special version of CWM to flash ROMs on this phone.
Holding power and volume down during a cold boot without CWM wont do anything and is not indicative of a locked bootloader. Also, holding power, volume down, and home is the software reset mode not recovery.
Determining if the bootloader is unlocked is the first step to getting some Devs in to develop ROMs for the Nitro. I do not currently own this phone but am very interested in getting one when my upgrade option opens up on the 15th.