Reflector 3 is a "view-only" app. So while we can get the stream the iPhone or iPad sends us, we can't ask the iPhone to do things for us. The only way to accomplish this would be with jail-breaking and running a custom app to send the data we want.
Android users who enable developer options on their device can use this menu to turn on the Show Touches option. This will enable the display of touch events on Android devices and this will show up in your mirroring or recording of these devices.