KLR-Mule, I went and read some of the FAQ's at JDJetting website on the Power Surge tuner.Does JD recommend deleting the o2 sensor with their tuner??
It appears you can adjust fueling in all three zones of engine operation: Idle, midrange, Top End (2/3 throttle or more).
You can reduce or increase the fueling from the middle setting of #3, which is stock baseline. So you choose the zone you want to increase/decrease fuel, and go above or below #3. In theory, this should allow you to slightly increase fuel at idle speed, which in theory, will eliminate the loud popping you get from deceleration.
I don't know how this would affect the clutch switch bypass hack, and whether reconnecting the switch and thereby enabling fuel cut at closed throttle, can still be eliminated with the Power Surge tuner by simply increasing the fueling at idle by one point.