Is it possible to extend the interior lights fade out? Using nanocom?

No, or at least there's no setting for it, so it doesn't look like it.

I've got a query that has intrigued me for a while too. Why is EAS movement inhibited when the brakes are on? I can understand why it won't move with a door open as you wouldn't want to lower to Access if you have a door open and you are parked next to a high kerb or similar or you could crunch the bottom of the door. But if you pull up and want to drop to Access to allow someone to get in, you have to put it into Park and take your foot off the brake pedal. It would be so much more convenient if you could just stop, drop it, allow your passenger to get in and then drive off (I'm thinking airport pick up and drop off where they only give you milliseconds to get in and out).

I lock mine permanently at motorway height which suits us .

i suppose the next question is do the later models do the same or did they change it out, if so, it might be some form of safety device that they came up with.
similar to cars that need the brake pedal pressed before they will start.

Now you mentioned it, I have noticed that on the 02, if it has been in motorway height, it will go back up to standard height at a traffic light with the brake pedal pressed if the light is long enough.
Not sure if I have ever tried dropping it to access with just brake on, but not in park.

Yes, after 3 minutes of the brake on, it will move. If less than that, it sits there showing Motorway height steady and Standard flashing and rises as soon as you come off the brake. Whether it will drop to Access after 3 minutes though I've no idea and have never tried (although will now).

I think the reason for inhibiting EAS when the brakes are on is because at certain time intervals while driving, the EAS will open the valves to re-level the car. If it tries to do this during hard braking it could cause the car to bottom out the front suspension.