This app manipulates .plist files in the game directory located at
/sdcard. After enabling the program, the folder named
eds is copied to
eds_backup. When you select a particular quality setting, all files in folder
eds are replaced with the corresponding file from
eds_backup. When you disable the program
eds folder is restored from
eds_backup to its default.
If you don't want to install this app for any reasons, you can change the setting manually by manipulating .plist files.