The trainer can hold a power target. The next thing I wanted was terrain: ride an actual road, indoors, with the gradient driving the resistance.
So Domestique grew a Routes library. Import a GPX, save a route from any activity, or pull one of your saved Strava routes, then play it back during a free ride or a structured workout while the elevation profile drives the trainer's simulated gradient. There is a trim editor with draggable chart handles and undo/redo for cutting a clean segment out of a messy GPS track, and you can reverse a route end to end.
The first route I bundled was Mont Ventoux, in three presets for its three classic ascents. Climbing the Géant de Provence from my spare room in Fujisawa, with the resistance ramping up exactly where the real road kicks, is the closest the indoor setup has come to feeling like the outdoor one.