Case I like the idea, and obviously it works since you've been doing it for over a year, but I would think one side of your cooker would be hotter then the other. Maybe not enough to make a difference.
Chris.
I've been using the side light method for close to 5 years now.
Yes like the snake method or Minion method the area that is lit produces more heat. This is not an issue for low and slow cooks where a diffuser is being used. For hot cooks where I don't use the diffuser I will light through two or three of the lower vents. The heat is then evened out.
