Are we allowed to use a microbit to connect to another microbit somewhere on our sphero RVR to control it? I am not sure if it violates the communications rules outlined in the game manual. I will still be connected to the RVR using Sphero Edu.
Yes you are allowed to use a microbit to support a mechanism on the RVR
Yes, refer to a previous answer to a very similar question for a little more insight.
8.3.4 " There are no material restrictions on additional mechanisms or accessories added to the AVR Drone, Tello Drone, RVR Fire Truck, or Sphero First Responders, provided that no other rules are violated."