Hehe -- actually there is a simple plastic insert over the seatbelt lights, hire a graphic artist and voila -- full airplane simulation!That would be pretty funny, actually. I'd pay $20 for one.
It's odd that MB went to so much trouble with other lights but didn't illuminate the one switch that needs it the most!
Do other models have the 4-position switch illuminated? Any chance of interchanging parts?
There is also just a little bit of room inside my switch, if you got really ambitious you could probably wire something up connected to whatever supplies the sunroof switch illumination. Don't know how you'd ensure nice faint/even illumination though.