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Solo merit farming and underhand 5th column tactics are grinding PP into the ground on occasion at the moment and i like fairness in my gaming.
"Underhand 5th column tactics" are exactly what PowerPlay is about.
"A fifth column is any group of people who undermine a larger group—such as a nation or besieged city—from within, usually in favor of an enemy group or nation. The activities of a fifth column can be overt or clandestine. Forces gathered in secret can mobilize openly to assist an external attack. This term is also extended to organized actions by military personnel. Clandestine fifth column activities can involve acts of sabotage, disinformation, or espionage executed within defense lines by secret sympathizers with an external force."
You'll find that nowhere in that definition is mentioned overt combat. You'll also find it pretty close to the given mechanics of PowerPlay. The Powers are not at war. Outright combat is not intrinsic to the mini-game.