Turn off CLEAN_INSERT behaviour (appfuse, dbunit)

Hi can anyone tell me how to turn off the automatic dropping and re-creation of the tables (who wants this ? after spending half an hour importing test data!).

This is really annoying and you would think this question FAQ material (it is not).  I looked all over the place for an answer - I must be thick.

Many Thanks - Appfuse is great! Well done!
JP