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Usually my WebTests are coded WebTests, but sometimes the plain WebTest can do the job a lot faster.
My biggest problem working with plain WebTests, is that all the input to my forms are the recorded values. In some of the text fields I need value variations every run.
To solve this problem I created a [...]

Bill Barnett has posted a great article that describes the data model of the load test result store. This is all you need if you want to create your own custom reports.

http://blogs.msdn.com/billbar/articles/529874.aspx