I am trying to figure out how to mod tourism output. I already saw in XMLs how Pedro generates tourism during Golden Ages and how the International Games increase it (it's hardcoded in the DLL, right?). Is there any simple way how to add something like +50% tourism output? Or if there is not, is there any simple way how to create a trait where other civs would more willingly sign open borders or get boost to relations and therefore boost tourism from the player?