It would also be cool if there was an online leaderboard-type thing where we play scenarios and it ranks our time against everyone else's.
It has been recommended before, and implemented within a thread. The thread was largely a failure for various reasons.
First, the game would need to be online. And when it is online, more people would make threads that say: put online multiplayer in it!
No. Remember the old Rigs of Rods site with the different missions on different terrains that logged your time? I'm thinking of something like that.