Consequently, is it possible to have super speed?
In fact, out of all superhuman abilities, super speed is the one most attainable for the human body if you are conditioned for it! It's a shame you won't be around too long to witness your own greatness, however. That's right, with great power comes increased aging and early death.
Likewise, is there anything faster than the flash? Wally West's greatest villain and arguably “faster” than any speedster, Hunter Zolomon is most commonly known as Zoom (though he has also gone by the Reverse-Flash). Still, it's a power that has allowed him to consistently outrun Wally, and just about any speedster who has ever had the misfortune to face him.
Correspondingly, can the Flash run faster than light?
Depends on which Flash we're talking about here, but the short answer is yes he can. The 2 main modern Flashes, Barry Allen and Wally West are both capable of running faster than light. They run into issues running so fast though, as they start to brush up against the Speed Force.
Can human get super powers?
No such gene exists in humans, and we simply don't know enough about the genetic potential of our genes to produce superhuman abilities. We do know that some humans already possess abilities that appear like superhuman powers.