So, as far as I understand, it is allowed to have the mouse move but not allowed to have the mouse movement itself be a gameplay mechanic? Say the difference between clicking on several items on screen in different places and moving the mouse and something more akin to fruit ninja?
I'm not the host but it sounds like they're saying that the only player input that should be used during gameplay (excluding navigating menus/UI) is a single button. So checking WHEN the player clicks their mouse or taps their screen is fine but using the LOCATION of a click would be against the rules from my understanding. Think flappy bird for example, it registers your taps but WHERE you tap on the screen has no bearing on gameplay.