1. i would just have new vehicles have it, and then old vehicles are how it is now? until they are updated that is
2. useful i would say, although it isn't too bad
3. that would ruin dark maps
4. basicaly you want more colors, then why not make a colorset for your needs?
5. what would be the use? you can just change your scale
6. possible with an addon i would think, although why not just use the crosshair switcher and make the crosshair out of the game?
7. would be useful, but why would you need to remodel them, as the things you want have nothing to do with modeling
8. the option to turn it off would fix that, and what is the point of it?
9. why would going downward crash you, or going fast upward? and you can make a limit
10. if you don't want the lag, don't change them? and it would be useful