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You might be turning the gun on yourself if you ever have to implement this.
Disclaimer: I would never suggest running this in a production environment without good reason. I was asked to come up with something that will automatically kill blocked processes until the developers could figure out how to fix it (despite my suggestions for performance tuning).
I wrote a simple stored procedure and it was placed into a job that ran continually. You can, of course, modify the query to be more specific like kill only SPIDS for a certain database, or user, or hostname etc...
Also, it might be a good idea to add in some error handling and logging.