You cannot add exceptions to the rule, no matter what. Their "work arounds" are made up untested nonsense.
Example: Skout.com, Meetup.com, etc.
You cannot add exceptions. The only workaround is to disable it, link accounts, and then re-enable it, making the entire app nothing more than a useless chore. Use Multi-account Containers instead. They allow you full control. Any container app that doesn't give you 100% simple one-click control is suspicious and bogus.