A log book that accumulates hours / kills, etc, but instead of tracking "deaths", it resets! (you're virtual pilot dies!) Wouldn't that change hyperlobby tactics!
Clouds that aren't always "close" to you. Clouds that actually had tops around 3-5000 (or whereever you set them) gives a feeling of altitude. In lomac, no matter where you set the clouds, they are always nearby.
Airframe damage due to over stress. (flaps, etc)
Hand signals / more head movement (for nodding)
Formation lights