That’s just your typical cheap direct drive FET driver. Nothing special there. The blank pads are because they probably use the same driver PCB for a lot of different light. An inductor could get you a lower low, but I don’t think it’s worth the effort.
All you would need to do with that is bridge the input resistors and piggyback a 105C to control the FET to get the better firmware and modes. Basically, do the same thing as Comfychair was doing a year ago.
The FET is probably pretty crappy, but if you only want 9A it might be what you want anyways. I want 15A+ out of my lights, so those ones have to go.