It definately needs people. Maybe two tracks allowed per area? And they should make the area a bit bigger. Tools built into the game like a node smoother, tunneler, etc. They need to have more types of coasters. I'd like to see, and I'm sure everyone else would like to see, Arrow Suspended Coasters, B+M Flyers, 4D coasters, and new Itamin trains. I'd also like break fins for the launch on the itamins. They should also have some sort of auto-steel supporting.
Also, I like the mist idea, Worm.