I'm going to answer your questions as best I can from memory:
1. I believe the colored lines indicate traffic rate of flow, just like the "traffic" feature on Google Maps. Like you, I have not noticed the icons you referenced which are on the E60 nav system.
2. Can't answer this one. I don't use the voice commands much at all.
3. The shift lights only illuminate when you get very close to redline. If you're still in the break-in period (and adhering to the break-in rules) you won't be able to see them yet.
Hope this is helpful.
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Current: 2022 Donnington Grey M5 Competition, 2014 Anvil WW Jeep Wrangler
Previous: 2019 Donnington Grey M5 Competition, 2016 Silverstone M5 CP, 2013 Monte Carlo Blue M5 CP (ED on 9/1/12), 2009 Carbon Black M5, 2006 Silverstone M5, 2003 Sterling Grey M5, 2000 Anthracite 540i6, 1998 Jeep Grand Cherokee 5.9Ltd, 1990 Eagle Talon TSi AWD, 1978 Mazda RX-7
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