How do you tell an abandoned project from a FINISHED, COMPLETE project, that's not getting any more updates because it doesn't need any?
Viewing post in *Feature Idea* Flagging abandoned projects
I'm no stranger to coding. It wouldn't be that difficult to add a feature that the dev can enable that marks the project as complete, or even on hold (which could extend the timeframe before a project can be flagged as abandoned) Once marked as complete, then the option for users to flag as abandoned can be disabled. It's really not that difficult of a concept.
Not to mention, there's already an "In development" marker on projects that are... Well, in development, it's not too much of a stretch to think that there's a way to change that "In development" marker to a "Completed/Finished" Marker. Which would obviously remove the ability to flag as abandoned.
I also seem to remember a search tag that allows you to filter search results for completed games only. ( I may be wrong here, because it's been a long time since i've used it)
These are just a few possible solutions that are already inherently built into the server's UI, or at the very least relatively easily modifiable.
I may have misunderstood your question actually. If so I apologize. The only other way I could think of answering it would be the developer. The one's actually responsible for the project would have a clear idea about what scope they want for their work. Once they are satisfied with their work, and feel it is complete, the developer would be responsible for marking it as completed. At which point the flag as abandoned feature could be permanently disabled on that particular project.