If you read the petition page you will see that it isn't my petition. It is run by a guy called Geo (you can find a link to his site in the links section). My petition page simply links to his petition. You'll have to ask Geo if you want the answer. My guess is that he set up the petition before WM was released and didn't bother to update the options (or maybe he wasn't able to alter the settings once the petition was set up, although this is unlikely).