Hi Srikant,
Not sure why it is not picking the value as it is recommeded for DB2.
Option we have as:
1. As you have mentioned you have modified the control.XML and restrated from scratch, I would suggest modifiy the Control.XML immeditlay after giving all neccesary input for export. Once Control.XML is modified stop SWPM and start it again by selecting option Restart from Old Run.
2. Pass the parameter for Jload as per the SAP note: 2076081
Regards,
Anil