Here's an idea: Create a new map with an adjusted reward system. The map could be the 22-player Mediterranean match. The game ends after 30 days, no matter what happens. If you maintain your core entirely, you gain 200 gold. Every player's original capital you control adds 300 gold to your rewards (200 gold each if you don't own your entire core).
Another idea (with the same map) would have a reward system as follows: The players are limited to a 30-day match, game ends by that date. 17 of the nations get the domination assignment (typical reward system based on VP), and the other 5 nations only have to maintain their entire core to get 500 gold. These groups would be labeled: Conquerors and Defenders. The defenders, if they are interested, could change to the conqueror group, but conquerors cannot change to a defender. Also, defenders can only move their troops within a reasonable distance of their original borders (If turkey tries to move their units more than x km away from their nearest province, then the unit will begin losing hit points after exiting that ranged area - a popup will appear to notify players of this if their command will lead to a loss in hit points). The border limitation vary for each country (as to not give countries like Northern US an advantage). And defenders CANNOT move their capital or trade away their core provinces.
My favorite idea is that the players choose defender or conqueror, the difference from the last one is the player can choose. A player can choose if they want to be a conqueror or defender, this mode does not allow for country selection (that choice determines the possible countries for you). Up to 7 players can select defender. Great countries for the defender option could include: Northern US, Morocco, France, and Yugoslavia because of their likelihood to be part of a larger empire.
Other countries of the following were not selected because:
UK - distant provinces, Russian Empire - too large, Others - too close to great countries or too easy to remain safe
If supply drops exist on the map, they are more likely to land within the core land of a nearby Defender nation, just to make it even more difficult.
The goal of these maps is to increase diplomacy, I know the game was intended to focus on war, but in real life, some countries are satisfied to remain as they are (not everybody wants a large empire). That was the motive behind these ideas. Of course you cannot have everybody play defender, otherwise the entire game concept is destroyed.
UNLESS you create campaigns where you fight AIs. There you can select either option and the AIs would come at you with increasing difficulty as you proceed in the campaigns. The only replay-able level (at least for experience/rewards) is at the hardest difficulty where enemies are on all sides (like France) and you fight Elite AI.
"Know your enemy and know yourself and you can fight a hundred battles without disaster." ~ Sun Tzu, The Art of War
"War does not determine who is right - only who is left."