1. An electronic device comprising: a housing; a finger biometric sensor carried by said housing; and a central processing unit and a mapping storage unit cooperating therewith and carried by said housing for mapping a plurality of different tasks associated with different fingers of a user; said central processing unit and said mapping storage unit being configured to perform a user authentication based upon said finger biometric sensor sensing an enrolled finger of the user; said central processing unit and a mapping storage unit being further configured to perform, after the user authentication, a sequence of nested subtasks for a given task from among the plurality thereof based upon said finger biometric sensor sensing the corresponding finger of the user, each of the nested subtasks in the sequence being different.