Yea, not sure if it would throw an error thinking the bulb is out, you may have to put a resistor in place of the LED.
They really did bug me at first (and I wrote as much in my initial review), but I'd suggest sticking with it. I genuinely don't find them distracting in the slightest now. And lots of people get in and say how awesome they look
Yeah I have driven at night lol. It must be that the ambient lighting is switched off then. I just assumed that the speaker lights only came on when the doors opened, like courtesy lights. My ex has a Diahatsu Material that has lights surrounding the speakers and hers stay on all the time. I will have to look through the menu settings as that is how I collected the car.