Mr. Vintage has again hit the nail on the head.
We're not pedantic with this, to some extent it's 'what it looks like' out of the window.
and
No reason why you shouldn't ask for particular lights if you want. I would always respond to a request inc varying intensities if possible.
On this side of the pond we've also got clear guidelines as to "what lights when." However, the lights are there to help you, the driver, not me, the ATCer. The local controller is always prepared to make adjustments based upon what it looks like out there and, most importantly, what a pilot requests.
So ask. Mine's a service-oriented job. So is ATC at your airport.
Dave