CAs must be added/deleted manually. In other discussions this topic has been discussed in detail.
Coming in 7.2 is "subscribed lists" or "McAfee Maintained lists" will be a new feature and apart of that will be the "default known CAs". We (McAfee) will maintain a list of CAs that will automatically be updated. These will most likley be similar to what is in your browser's trust.
The new "default" will most likley be a reference to a subscribed list of "known CAs".
Let me know if this helps,