Where else should all "Special Airports" listed in the GOM be present?
In the crew brief.
Do all "Special Airports" have SAG briefs?
No. If one is not present, then an ODO or CPO brief is required.
What does "APG Takeoff Performance required VMC and IMC" notation mean?
The company has determined that the increased risk of performing a VMC climb isn't justified. APG performance numbers MUST be followed.