It would be awesome, and Tactical Intervention proved that it's doable on the source engine, but you're right, there are more important things to be done right now. If you haven't already, you should check out Tactical Interventions vehicle levels. They are awesome fun. Maybe some day in the future we can do something like that, for now you can play Wizard Of Distortions' level Da_chase - a map that takes place in a high speed tunnel where you jump from car to car. It should be up on his custom maps server iirc.