These questions are more for Orbiter than Aces High. They have their own forum you could ask them on.
But, I want to help so...
1. Sound. There is no sound that comes with the normal game, but there is sound as add-ons that you can download from various websites located in the Links section of Orbitersim.com
2. There is no way to program the keyboard. This is freeware, so we're lucky just to have it at all.
3. Clearance to take off or land isn't needed anymore in this latest version. Actually, it wasn't really needed before either. Now it is a dead function though.