"2. Start/Stop button: Pressing to start is not complicated or unpleasant, but in order to shut down the engine, I have to first press stop, apply the hand brake, press the "P", then take the foot off the brake, then press the stop again. I have restarted the engine several time inadvertendly because my foot was still on the brake. "
Why on earth you doing all those steps? With foot on brake, press "P" to put the X1 in park and push the Start/Stop button. That's all you do.