Hi,
In my last project, my team member created task list using BDC as no BAPI's were available . He told me that in later releases SAP has come up with an option for creating task list using BAPI.
So check in SE37 whether any *task*list* is available starting with BAPI. Otherwise do whereused list on table PLKO and see whether you find anything interesting.
Regards,
DPM