No, there are other options.
Of course, you can also operate Flying with just the light switch, but you want more, right? The most intuitive and fun way to operate it is via the app, but you can also (additionally) switch and dim the light using a corresponding (wall) button. With this solution, the light, button, and transmitter must be set up with the app once. You can find further information in the GRAU App Tips section.