Sorry, but for now I'll stick to the ageing "Dockless" because I don't want to unnecessarily (I'm using a PPC Mac) have to change my AppleScript apps to app bundles. (Your wording, "…is not an app", needs changing). Other details from my 2-minute testing:
    I suggest you make your app a "droplet", i.e. drop the app to be (de/re-)docked onto your app's icon rather than having to launch your app.
    I'm not convinced that an authentication (presumably to use sudo) should be needed, but if so then at least save the user a click by setting the focus to the password entry box.
    Your bottom text area needs an extra line.
    I don't like unneeded Console.log entries. Couldn't you send output to the 'deep black hole' at /dev/null?

I hope you don't think I'm being too arrogant. A bit more work and I might download and keep a future version.