I have a few off the wall suggestions for Model 3.
If a feature already exists, please let me know and I'll remove it.
Sound System
Programmable Automatic Audio Volume Adjustment
The faster you go, the higher it reaches defined threshold (louder on the freeway) -- as you slow down the volume goes down -- more awareness while driving slowly (pedestrians, bicycles, and other typical slow paced driving one should be awaree of).
Auto Sensing of Emergency Vehicles and/or Road Conditions
Turns down stereo sound automatically based on external microphones or detection of emergency vehicles (with applicable vocal warnings) or reported accidents, etc.
Window System
Similar to the sound system -- weather is not raining, snowing, etc -- automatically rolls down or up windows at predefined speeds and at different levels for maximum wind to pleasurable external air experience.
Intranet Communication
Sensors for pot holes, rain conditions, ice, oil slicks, hitting dead animals, etc. When a Tesla car encounters such (based on a variety of sensors from shock, vibration including surface detection), it communicates to a Tesla network and transmits the information to other cars automatically. This can include congestion in traffic to maximum speed of routes. Possibly based on a tally, so if 3 cars find a pothole and 1 doesn't, the pothole exists -- or vice versa. The driver's can be warned of upcoming conditions continuously -- or if self driving it will re-route.
Semi-Complete Hands Free Operation
This should be a discount for auto insurance as it will heighten and assist in driver awareness.
Other than the steering wheel, break and acceleration, the car should have full speech recognition for nearly every feature and not require one to take one's eyes off road. Open the windows 30% HAL. Turn the radio station HAL. Set the temperature to blah blah, HAL. HAL, report heavy traffic. HAL report accident. HAL (example name) should be able to read text messages from friends and reply to text messages (voice recognition) - same with e-mails, surfing the web, etc.
Thanks for reading!