in my workflow when a story is delivered, can I set the transition to reassignee the story to my QA user? Also, If QA rejects the story, can transitions reassignee the story back to the programmer?
You can use "Update Issue Field" or "Copy value from Field to Field" post function. The firts one can be used if you know the value already and is same for all issues. Use the second one if the value is different on different issues and is stored in some other field.
Here it is some documentation about working with Post Functions in the workflow:
Like Jobin said, you can use the Update Issue Field for Assignee, description, summary and more.
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