Nothing significant, but a few items:
1) Improvements for phantom window roll downs. If it's an electrical or software glitch, fix it. If it's user error, maybe redesign the layout and buttons a bit to make it harder to press the window down buttons when getting out of the car.
2) I noticed the washers acted a bit wonky. Someone else mentioned them. I haven't investigated closely yet, but their performance on the road seemed iffy. I thought maybe the washer fluid was low, but based on other comments in this thread, maybe it's the design.
3) I do agree physical wiper controls would be nice. However, I did test on the latest software update, and you can use voice control to turn them on. Might be new with latest update.
4) Would be nice if the rear vents were the type that could be completely blocked, or a control added in the back to turn them off via software. On our last trip, the driver sure had to turn them on and off a lot.
5) Heated steering wheel option. Always wanted one. Never in my life have been able to get one. I've driven far too many days in my life with freezing fingers. Really, my fingers are the only part of my body that I feel needs help being heated. I don't give a rats $$$ about seat heaters; never in my life have I thought my butt was too cold.
6) Longer range battery option. Ideally I'd like to be able to skip every other supercharger station. The nav actually tried to make us do this a lot, but the estimated remaining was under 10% most of the time, and with it being winter, the actual ends up being less than estimated. End result, it was just slightly too tight to risk it. Could really use 350 to 400 miles of range, closer to what the max range S currently gets. This was for a trip between Kansas City and Denver. I think in summer it would be no problem, but when do most road trips tend to occur? Around Thanksgiving and especially Christmas; the cold weather months.
7) ALMOST FORGOT! This one is just a recommended software update. Add the ability to see and add additional superchargers to a navigation route. This would have been really helpful the multiple times we decided we weren't comfortable going to under 10% estimated battery remaining (because an estimate of about 10% generally realistically means 1 or 2% actual).