Jesper Nielson of Denmark has created several scripts for Zwift users, and my favorite is zwift-preferences. This script lets you set trainer difficulty effect, choose which world and course to ride, toggle Neo road feel, and set a variety of other preferences.

zwift-preferences

Get it here–I highly recommend downloading the compiled version at the bottom of the page if you’re looking for a quick and easy install. Once installed, just navigate to the installation directory and click zwift-preferences.exe to run.