Summary:

Does EMF enable heuristic virus scanning?

Yes, EMF enables the heuristics functionality of the Olympus Virus Engine (from NAI) by default. There in no option within EMF to disable this functionality.

Additional Information:

From McAfee's web site 10/2002, about heuristics:

Protection from the Newest Threats
Uses advanced heuristic technologies called ViruLogic to
seek out previously undiscovered viruses. ViruLogic has the
intelligence to know what characteristics viruses do and do
not exhibit, giving you unparalleled virus detection with
the fewest possible false alarms. When a new virus is
confirmed, the cure is generated and distributed to infected
systems. VirusScan employs Virtran, a virus specific
scripting language that creates detectors and cleaners in
seconds-a quicker fix for the most ferocious new viruses.