I can't belive these were forgoten!
1. Real economics, including competion from other parks, selling stock for your park, worrying about stock market crashes, ect..
2. Block systems, so the coaster won't crash
Other things it should have are:
1. Short stations, but you need storage track if you want more than one trains.
2. Manipulative track mixed with the current kind, so you can make track steeper, more banked, tighter, etc...
3. The inability to change train types on steel-twister once it is built. How many parks do you see going from stand-up to floorless to sit-down and back?
4. Overpriced restaurants
5. Stages for stunt shows, concerts, magic shows, etc.
6. Stadiums with water tanks for Sea World style shows.
7. More go-kart options (ie. faster cars, double cars, slick track, wooden or pavement track)
8. A website that is maintained
9. A ride exchange that works
10. More flat rides
11. 50 copies of the CD so you don't have to waste time and money burning it for friends ;)
12. Inverted stand-up woodie, J/K
13. Another category of rides/attractions: Kiddie rides!
14. More theming
15. Trees that are dynamic, and don't sit there like a boulder shaped and painted into a stone.
16. The ablitiy to use a trainer without installing a patch.
17. Random deaths (like Goliath and the anurism lady)
18. As someone said, law suits
19. Ablity to design/enlarge the entrance.
20. Day care and kennel
21. More than one peep style.
22. License ride names, so steel twister can be called B&M, steel corkscrew Arrow, etc...
23. Parts warehouse, if it's not big enough, it takes longer to repair rides.
24. Off season, like someone said. And it's the only time you can start building new coasters.
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Everybodys got something to hide except for me and my monkey!