With the first Rimworld DLC, Royalty, there was an interesting new addition to the gameplay. A new way to win was introduced, called Royal Ascent. To get to this ending you need to climb the royal ranks to Count, then protect the Stellarch for 15 days, whilst keeping his mood above 25%. The Stellarch will then give your remaining colonists a ride off the planet. Given it's unique way to win, I'd like to suggest that it be added as a new Escape% subcategory.