atleast you brought up an issue that you felt neede to be taken care of, i reckon if you ask karloz25 himself(nicely of course)
he would change it and put a more appropriate sig, cause personally i dont think there should be a rule as such, karloz is cool so he'l probably change it,
theres no need to go to a moderator for a small thing

anyway i hope iv helped to resolve the situation(if ive done in anyway possible)