You can exclude the folder in custom and scheduled scans but not in full scans or real time scans. Maybe send a file to mcafee via
When they reply reply to the email changing the subject to false +ve and name of detection. Add why you think it is so and say you have many files being picked up like this.
post back with your analysis ID number and see what happens. If no solution in 7 days I will stir a lab tech up.