Our input customization features are currently limited. You'll need to have a way to press more than one mouse/touchpad button - ideally we recommend that you use a mouse, but if you can't, you might still be able to customize your touchpad. Some touchpads have physical built-in click zones at the bottom. If yours doesn't, your operating system still might - for example Windows allows you to configure the lower-right corner of the touchpad as right click. For scrolling, you can use a two-fingered gesture.