Tracking Non-Approval Workflow Steps

Using PeopleSoft FS/SCM 9.2.55, PeopleTools 8.62.07

Many business processes have steps during which the workflow for a transaction pauses while an actor performs an activity, then after the activity is performed work continues (e.g, the transaction is submitted for approval). What's the recommended best pattern for handling use case within PeopleSoft?

1. Activity Based Work Items (traditional work list)
2. Approval Process -make one of the "approval" steps for the transaction this work step, and have the worker click 'approved' when done (they're not really approving)
3. Record Flag - add a flag or state column to the header record (e.g., PO Status w/ Dispatched), items in a particular state are pending work