The “Personalized Templates” feature gives you most of what you need to set up a rematch.

This will allow you to create a new game with the same settings as any existing game.

To do this, visit the game and click Settings, then click the template name.

The only part it doesn’t get you is allowing you to play with the same players. You have to add the players you played with manually.

I’m marking this idea as completed. If you want players to automatically be added to a rematch, you can move your votes to this idea:

http://warlight.uservoice.com/forums/77051-warlight-features/suggestions/1350897-allow-players-to-be-saved-as-part-of-a-personalize?ref=title