Ok, I take it all back. You guys are correct. You can change your list!
I consulted my mentor
Dr. Emmett Brown for advice, and he actually confirmed that it IS possible to change your ROL after the deadline. All you need to do is build a
flux capacitor and install it into a
DeLorean DMC-12 (believe it or not, these were not offered as an option while the short-lived DeLorean was in production). Then as long as you hit the wire from the clock tower with the connecting hook on the back of the car while traveling at precisely 88mph the instant the lightning strikes the tower, you'll build up the requisite 1.21 gigawatts of power necessary for traveling back to 8PM EST on 2/21/07. This would give you exactly one hour to change your list and submit it to the NRMP.
He warned me, though, that you have to make sure that you don't meet your past self submitting that original (wrong) list, because then you might cause a time paradox and destroy the universe as we know it. Good luck.