Firstly howdy and welcome to the site.
Not sure on the interior lighting programming (I've only just started playing with my V-Checker).
But what's wrong with driving with your parkers on during the day? I do it all the time for two reasons. One is as you mentioned it is heaps easier to read the display and the second is it makes it easier for drivers to spot you.
I know it's hard not to spot a bright red Polo, but there are plenty of idiots out there.
Cheers,
Trent
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