For example, take Muppet's 40 Africas map. Imagine a setup in which the first player to control the 4 centermost continents wins, regardless of army production or any other territories held.
You could pretty much accomplish that now. Just make a bonus that encompasses that space, and make it worth a ton of armies. Effectively, whoever gets that has enough armies that they automatically win.
You may be thinking, "but they still have to clear out the rest of the map!" In theory yes, but in practice, everyone will surrender as soon as they see someone has the victory bonus. They can say so in chat, and it's confirmed by seeing that person deploy a ton of armies. Even if someone happens to be far away and can't see the deployment, they'll be convinced once they see 90% of the players in the game surrender. In practice, I'm sure the game would end within a few turns as long as there aren't any trolls in the game.