First of all, I scanned the stickies and I'm not completely new to backtrack or linux.

My evil plan is to "hack" a USB hub & a small usb drive in to the chassis of a laptop. After that, I'll dualboot 7 pro, and some flavor of linux. I have no doubt that grub will handle this (dualbooting) without issues. My question is how do I then boot Backtrack 4 from the internally "mounted" flash drive.

I don't want it necessarily to show up as a boot option on the grub main page, but I would like to use grub to load backtrack. I don't want to have to go in to the bios every time to switch back and forth.