The
schematic for the LS1212 shows a separate controller that has a cap in series. Maybe changing the cap value would make it stop faster.
BTW, I was at Home Depot getting some blades and they had some of the drill/impact driver kits on sale. The Makita kit (the consumer grade models) were on sale, also MIlwaukee but I chose the Ridgid kit. My decision was based on the lifetime warranty of the entire kit, including batteries and charger, and the lowest price. I have no doubt that the brushless Makita is a better tool but will wait until the dust settles on brushless to pick one of those up. The Ridgid impact driver has the highest rated torque but we all know that real-world and mfg. ratings sometimes don't jive.