Today my pull request got merged that adds the Shrek SuperSlam Gecko codes to the main build of Dolphin. All Dolphin builds from 5.0-1393 should ship with the codes by default. This is certainly a victory for the scene and should make setting up new players and eventually moving netplay builds easier. That said, I wouldn't jump ship just yet, Toast is the main authority on the netplay builds. Also, if codes get changed or more are added, they probably won't make their way to Dolphin immediately, so be sure to check here for the most up-to-date version of the codes.