In my 1.03bb I'm going to put a full set of manpower events for all the major powers. Each power will recieve a certain amount of manpower every 6 months, instead of a large clump to start with. This gives the realistic effect of 'dwindling' manpower, and the AI is also able to build new units, instead of only reinforcing its current units. Every country will be balanced to run low on manpower at a certain point in the game.