Question about definition file

the IsSigned flag is in the Game Explorer registry values

and by changing that i didn't mean to bypass the signing process but merely to make the content rating that i added to the GDF I made appear in Game Explorer

I do this because I repack some of my very old games like MOH: Pacific Assault and Max Payne, Mafia and so on and some of these games are released long before the CA system became known

i know i can't sign any package but i can make content rating appear by changing that in the registry manually

again question is: is there a way to change this value automatically?

again thanks for you patience Joe