On this particular add-on the sql uninstall should work fine to remove the configuration options.
For the files just compare the file and folder structure of the mod with your shop (with Beyond Compare for example) and it should be easy to see what files have been left behind.
Steve
github.com/torvista: BackupMySQL, Structured Data, Multiple Copy-Move-Delete, Google reCaptcha, Image Checker, Spanish Language Pack and more...