You can use the red button for anything you like. NOS for example.
I use it for the line lock to do the burnout. I also have one of the two rpm limiters on the MSD unit wired into that so I don't over-rev during the burnout.
Oh yes that is a girl in the avatar alright. Just my type. I though it was a very taseful image compared to some of the avatars I have seen on here lately. Plus the colours are very seasonal don't you think?