Thanks for your socratic reply. I think I get the gist of it.

The CGI::Application documentation has a nice example of a very similar problem to mine. In that case, instead of using submit buttons, the example uses links. These links contain the run mode and another name/value pair indicating other information in the query parameters. That would certainly be one way to solve this problem, but I don't want to use links, I prefer buttons.

You also refer me to mode_param method which would allow me to choose a run mode based upon things other than something in the query string. I'm not sure how this helps my current problem.

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Nothing is too wonderful to be true
-- Michael Faraday