Today, Workflow Manager allows any user to create Custom (Private) worklists, and to perform an advanced search. The idea here is to have a security code tied to each ability so a site can control their users' ability to create custom (private) worklists, and perform full database searches.
This is feature:
F10727 - WFM Privilege: EA: Edit/Save Custom Worklist based on the ID_CreateCustomWorklist privilege