X-Plane can be modified in a number of ways with plug-ins that alter the functionality of the simulator. X-plane.org is a good source for plug-ins to accomplish wide range of performance outcomes.
- Unzip the downloaded file.
- Move the unzipped scenery package folder to X-Plane 11 > Resources > Plugins
- Restart X-Plane and enjoy!
For information on developing your OWN plug-ins, check out the X-Plane SDK site.