If I understood correctly, the main issue is that when the data to be displayed contained comma, and you set the CSV-rendering delimiter to be a TAB, all commas get replaced by TAB.
We made some tests in the Standalone designer setting the value of the FieldDelimiter
' (TAB) - '	'
was not accepted as a valid value for the parameter. In the exported CSV file the items were correctly separated with TABs, and the data fields that contained commas were not modified. We couldn't reproduce the problem. For that reason, can you give us more clarifications concerning your settings and the exact scenario?
Consider also opening a support ticket where to attach the project for local investigation.
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