I've been toying with an alternate version of Chrononauts in which players can only play inverters, patches, etc., on cards that contain a time traveler. Each player would control a time travel agency consisting of a number (5?) of time travelers and one time machine. Before the regular draw and play action each player would be able to move their time machine a certain number of spaces around the map, picking up and dropping off time travelers as they go. Has anything like this been suggested before?