I pack a couple of extra reusable grocery bags and put heavy stuff in them, then hang them from the stands as close to the ground as I can get without them touching the ground. Also, try to set up your screen where it's protected from the wind, any amount of breeze is going to be distracting.
The projector I have came with a remote and a full Google TV that plugs into one of the HDMI ports. Sometimes I plug in my game console, or cast to it from my phone, it's really flexible.