Also, if the proctor makes you enable Press-To-Test mode, it won't even matter because all of the extra features will be disabled.
I don't think they do that. When I took the SAT with my Nspire CAS Touchpad, I was the only one in the room with an Nspire (next most common was the 84, and after that were sci calcs like the TI 30XIIS), so all the proctor did was take a second look at it as he walked by everyone's calculators before testing.