I have a ticket for this one already and support is suggesting this http://www.symantec.com/docs/TECH215657
But this seems to be unlikely implemented by Symantec as it needs "other members of the Symantec Connect forum to view the content and vote for the idea. The more votes and idea has, the higher the possibility it has of being implemented in to future versions of the product."
We need to have a definite time for implementation of new supported versions of third-party AV for removal.