Okay I have an idea that might be really cool for you and all of us. You have a countdown and then she shoots the gun. The count down almost seems pointless since she shoots the gun randomly a second or so later. To really test our reaction times what if you sync the gun right at 0. This way we can hit the gas the second it hits 0. Or don't do a countdown like in real life and we go as soon as she shoots. That is most realistic, but maybe not as fun.
Her shooting is kind of hard to go by because she does several movements so its confusing when to actually go and I either find myself with a slow reaction time or disqualify for too early. My suggestion would be to sync the count down with the gun.
It currently goes, 6,5,4,3,2,1, she waits 10 milliseconds, then raises her arm (Gotcha jk) , and then fires. What was the point of the count down then, you know? I find myself sometimes hitting the gas/immediately hitting the break and then hitting the gas again being confused. Needs to be one action not several which makes it confusing.
Thanks for taking this into consideration.