Since he's leasing I don't know why you'd be recommending him buy an extended warranty now? If he decides to buy the car after the lease is over he could buy the extended warranty then.
I think the tire and wheel insurance is a waste of money. It's expensive and you need to read the small print if you continue entertaining the idea.
Since you're in Michigan the BMW/WeatherTech mats are a must. Touch up paint. BMW carbon fibre license plate holders- nice finishing touch and helps prevent them from bending.
Www.herringtoncatolog.com has nice car accessories. I always buy their trash bag that fits on the back of the car seat. Tire pressure gauge. Roadster Duster. Cell cup holder. There's lots of other nice items, too.
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2014 BMW 528ix M Sport- Space Gray Metallic, Mocha Nappa Leather, Anthracite Wood Trim. Packages: ACC, DA, DA+, Lighting, Luxury, Prem, H-K SS, SAT, Rear Shade
2013 BMW X3 28i M Sport - Deep Sea Blue Metallic, Sand Beige Nevada Leather, FS Wood Trim, HG Roof Rails, and BMW Apps. Pirelli P7 RFTs.
Packages: Cold, Con, DHP, Prem, Premium Sound, Tech