Renga,
I have had a look at the properties for UBEs, UBE Versions, Job Queues and Printers (in our system) and could not see/find any parameter for printing immediately. The only place this is set in an unmodified system (to my knowledge) is in the JDE.INI file on either the Enterprise Server, Application Server or Fat Client. Our system (E8.11 sp1 Tools 8.96C1) configuration is below (in my signature).
Neither Xavier nor yourself mentioned your system configuration. If your system configuration is different to ours, then there may be another option for setting print immediate. For Xe and prior the same applies as for our system - the only place this is set in an unmodified system (to my knowledge) is in the JDE.INI file on either the Enterprise Server, Application Server or Fat Client.
On the other hand, a number of JDEList members have modified their systems print immediate functionality. Depending on the actual mofications made, there may or may not be another option for setting print immediate.