if im slowing from speed ill either just pop it into neutral and cruise down using the brakes or just keep it in 5th until the engine is at idle speed, then pop it into neutral. id say idle speed in 5th is like 15 mph in my car so thats slow enough. downshifting from 5th to 2nd is pretty hard on the synchros, and then to feather the clutch like that is just wasteful IMO. i would only use the clutch for braking in an emergency where my brakes have faded or something.