How to append unique numbers to new duplicated post titles/urls?

Here’s the best way to explain what I want to do…

As of now if you create two (2) posts with the same title you get the following:

http://www.domain.com/test/
http://www.domain.com/test-2/

If you create a third post, you then get another url like:

http://www.domain.com/test-3/

I am working on a directory, so the odds of someone having the same name is pretty good; therefore I want to append a custom url string to the end of the duplicated name – not just a 1 digit number.

Is there a way for me to add a custom 4-5 digit string at the end of a duplicate post/page/listing? So that it reads:

http://www.domain.com/test/
http://www.domain.com/test-#####/ < the random string

thanks!

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