No need to uninstall, unless you want to permanently remove Shoddy Battle, but other than that, you can just re-download Shoddy and it'll replace the current settings. But, if you want to really uninstall it, go to the thread I posted on how to change the sprites to HG/SS follow the instructions to get to the 1.0 folder and delete the Shoddy Folder. Then when you re-download, you'll have the same folder there, but with the default settings.