You know how OpenRCT has the ability to progressively unlock scenarios that came with RCT1 and 2, right? Well...as it stands now, those are the only scenarios for which the unlocking (indexing) feature is available. It would greatly enhance gameplay to also have this feature for custom scenarios. You would create a group of scenarios (Beginner, Challenging, or Expert), create an index for the scenarios, and password-protect the progressive unlocking feature for that group of scenarios. Custom scenario packs would live up to their name with this feature.