The objectives for custom scenarios have some fairly strict limitations. A scenario cannot have an objective of more than 2000 guests, or a company value of more than 200,000. These are too low. Raising the limits on many of the objectives would be an improvement.
On the other hand, the Crime tab is too loose. Allowing 100% of groups to be vandals with a vandal happiness threshold of 100% guarantees that every group will vandalize. I downloaded one scenario from the workshop (which shall remain nameless), innocently paused and built a few rides and things. When I let guests in, they immediately started tearing the park up. It was pretty special to get several vandalize messages per second, every second. Not.
On the other hand, the Crime tab is too loose. Allowing 100% of groups to be vandals with a vandal happiness threshold of 100% guarantees that every group will vandalize. I downloaded one scenario from the workshop (which shall remain nameless), innocently paused and built a few rides and things. When I let guests in, they immediately started tearing the park up. It was pretty special to get several vandalize messages per second, every second. Not.