I have "Save Time Stamp" unchecked, "Save As XML" unchecked and "Save Field Names" checked. The generated file has the "timeStamp" field name in the header.
There were two problems - the wrong flag was being checked, and the wrong configuration instance was used. Both have been fixed in the 2.1 branch.
This issue has been migrated to GitHub: https://github.com/apache/jmeter/issues/1600