Nice mod! You will still have to tinker with the gate valve a little here and there.
I run It wide open when I add meat till I reach my set temp, then drop the gate valve back to 1/4 and it overshoots a few degrees and settles in nicely. I'm different than most on the vaults. I preheat to 400, I fill the charcoal basket up with lump and never have to worry about refueling. If you wanted to do the snake method, just stand up 2 firebricks and pour your coals around them, light one end.