Some of the sigs that you mention are from before the rule came to be, so it will apply to them if they ever change their sigs again, some of the others who are really large (Avrik) will be asked to shorten theirs. Ones like Rok's are very, very close to the current limits and from before the rule change so it is allowed for now.
Great, now I feel guilty for bending the rules...
Well any ways, thanks for the exceptionator!
501 X 126, that is pretty darn close. -RH