I think the head lamp washers do each side in turn, so as to deliver the maximum pressure to each headlamp.
And, You only get the lamp wash when you have the headlights on and use the washers for more than a second or so. Neat

The boot liner over the spare hooks out of the way onto the lip of the boot by way of the pull handle (I guess you already knew that)
But, there's nowhere to hook the washer filler cap out of the way on my D3, so it flips almost shut when your trying to fill the washer bottle up. Crap

Why can't the boot be remotely closed. That's something you could have fun with