Customize Request Data Task Form in Reusable Workflow
Actually, Request Data action doesn't allow to customize the task form (with Nintex Forms or with InfoPath) if that specific action is used in a Reusable Workflow Template (the button in the ribbon to Edit Task Form is simply missing).
Nintex Support has told me that's by design but I think that all actions that involve tasks may have their task form customized.
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Leif Frederiksen commented
When you were told it is "by design" - did you get some kind of reasoning for this design?