It would be great if we could edit the speed of our Mongooses in Race game types.
Also, in Reach, my Mongoose doesn’t seem to speed up when driving down hill. Why not let land based vehicles pick up speed when driving down hill by default? It would make more sense and feel more realistic.
I dont really see this as needed in Halo 4. Personal opinion.
I’d certainly like to be able to make a faster Elephant, assuming they’re in the game. Which they BETTER be!
Being able to edit the speed of certain vehicles in customs would be a nice addition. I’m sure there are a lot of cool things you could do if that option was available.
A faster Wraith would make it my preferred tank.
You have my seal of approval. 
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Cough breaks canon Cough cough
I think this is a fantastic and creative idea! 
No comments on the down hill acceleration?