I don't really understand what you are trying to do. Are you looking for something that you drag a file onto and have it ask your password? If so I really don't understand what the point would be.....
I simple want a file (automator/applescript) that when I drag a file into its icon will execute that terminal code.
Check out DuckBill it's a neat app that will let you gui-ify your shell scripts.
http://web.me.com/adamsdv/Duckbill/Duckbill.html
Otherwise I would recommend the Trash Icon!
Dang it...I missed the 'sudo' in your post...might still work for you tho..dunno