Thanks. I am actually most proud of the Trace Icon, Shotguns, and Scatter house rules.
Shooting: For Control Device, in my games, we use the lower of [DP or Sensors or Accuracy]. For Rigging we just use [Sensors or Accuracy]. We are still debating whether AGI or LOG would be used for VR rigged Gunnery. The book says AGI, but that relies on your character's physical body and you are not IN your body, you are in the Matrix. I always imagined you use AGI + Gunnery when physically firing from a vehicle, and LOG (which is mental AGI after all) + Gunnery when rigged in remotely and firing that same weapon.
Tailing: On pg 270, it says Rigged Drone Infiltration uses "Stealth (which I assume means Stealth Group, so...Sneaking) + Intuition [Handling]." Since a rigged vehicle is pretty much a rigged drone, we use that. Though I would argue to use Sneaking + Logic [Handling] because again, Logic is just mental Agility.
Basically, for our house rules, whenever the action is active or offensive in nature, we use Agility or Logic. Whenever it is defensive in nature, we use Reaction or Intuition. It makes it a lot easier.