Thanks Marty! That's exactly what I was hoping to find out. Knowing that the D7000 will allow us to tell the camera to totally ignore the lack of light and take the photo regardless is perfect.
There's so many little things that you look for when switching from one brand to another, and I guess it just never occurred to me there wouldn't be a 'no flash' setting on the 5100. Live and learn
Other than this little issue, I have been pleased with the 5100, and it's a great camera. Little slower on the FPS then the A580, but I knew that getting into it (And doesn't really matter that much doing studio shoots).
Guess I'll be ordering a D7000 next week, and switching forums
Again, Thanks to both of yall for getting back and letting me know that I wasn't overlooking a simple menu setting or something. I don't have much hair left, but being able to keep what I do have is great - LOL!