WebUI Test Studio's Developer Edition used to have such functionality, however we noticed a pattern that caused us some concern. Many users were attempting to convert their functional tests to stress tests – the problem is that stress scenarios need to be carefully thought through right from the start and recorded just for that purpose. Although cross-leverage is possible, most real world functional tests will not make good stress tests.
After consideration we decided it would be better to remove it from the product as it was promoting bad testing practices.
Hope this helps and please let us know if you have any additional questions!
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