If you have an amazing score then it might help a little bit with some adcoms... probably not very much though and the MCAT will be way more important.
I would not submit it, even if it is 99th percentile. Fairly or not, I have a negative impression of someone who tries too hard to impress. Once you reach a 3.7 GPA and a 30 on the MCAT, practically the only thing I care about is your research experience.