Just an update...
Lemon laws in my state require there to be at least 3 failures/unsuccessful repairs (of the same item) or the vehicle be out of use for 30 days (days need not be consecutive) before arbitration or any buy-back or recompense.
So, for examples.....
I'm on my 3rd tail light now so if that fails too before the warranty period expires Lemon laws come into play.
If any issues are not resolved and leave the bike out of service for more than 30 days total Lemon laws come into play.
Obviously the law doesn't cover items caused by misuse or neglect. It does cover safety items which I consider the tail light failures, final drive and clutch line to be covered under. Based on the behavior to date I fully expect this tail light to fail within the next 3000-6000 miles which should be before warranty time period and mileage maximums are reached.
I'm not a lawyer or an internet research expert, but from my cursory look at South Carolina Lemon laws, motorcycles are excluded - which would mean you're subject to filing a complaint under The Magnuson Moss Warranty Act. I suspect the dealership and BMWNA are acting within the legal guidelines of the warranty and aren't going to put themselves at risk of legal action that uses failure to comply with terms of the warranty as a basis.
I've had warranty issues with BMW before and the was fortunate to have a dealer who was in my corner. I think that 9 out of 10 times, this is what gets it done, since in most cases it comes down to customer retention for them and brand loyalty for BMWNA. It's a sh!tty situation for you, but I think the best thing you can do at this point is exercise some patience, give your dealer and BMWNA the opportunity to resolve the issues (per the terms of the warranty) and take every opportunity to express to them that you would be a long time BMW customer and this situation is putting that in jeopardy. If they continually get the impression you're already a lost customer, they'll just tow the line and do the bare minimum per their legal requirements under the warranty.
Sorry for your continued troubles, I hope it gets resolved to your satisfaction.