I would like to see more characteristics from the film. The Film Canon Mod is pretty good, but there are still many things to be improved.
http://i420.photobucket.com/albums/p...cenes001-1.png
Also, there should be more options to how the park is constructed. The island size should be increased, there should be a raise/lower land and water tool. There should also be a much larger variety of construction/building options: various roads/cruiser tracks, fences (electric and standard), maintenance buildings (which would have to be manually activated in emergencies), geothermal power plants (the island needs power?), airlocks between paddocks, and loads of tourist catered buildings (hotels, restaurants, pools, tennis courts).
A day/night sequence would be a great addition as well.
In addition to tornadoes, there should obviously be hurricanes (it's an island after all) and perhaps a "sabotage" type emergency (similar to Dennis Nedry in the film).
The warden should probably not use a helicopter (at least not early on), but have to use maintenance roads to handle dinosaur related issues. Also, retirement should hold more meaning. In Operation Genesis, tranquilizers are just as effective. Perhaps tranquilizers should have a significant delay (depending upon the size of the dinosaur), requiring executions in an emergency.