The crew lines, or getting ahead of the line, is designed for AIRLINE crews only, WHILE WORKING. Of course, the security people can't differentiate between the uniforms -they can't differentiate many other things, but that's an entire other thread-.
However, do you want to be embarrassed in the front of all those PAX you just caught off? Perhaps worse?
I, as a "regional" pilot will only get ahead of the line if I am in hurry for my show time and the line is long. Although, I have the right to do so. Don't want to aggravate the PAX even more.
BTW, I am not getting paid while in line.
DO WHAT YOU THINK IS RIGHT!