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I don't think that there's an automated way for XOOPS to do that yet, but I have a feeling that some whiz at coding could make it work.
Generally, I guess you'd have to take an article module - news or AMS probably - and set up the categories you want accepted stories to be placed in. This section would be visible to everyone that visits the site.
Next, you'd have to set up duplicate categories visible only to registered members. This would be where stories are voted on.
Now comes the part where wunderkind coders come in. Some type of code would have to be written that checks the articles in the submit section. If it has a certain amount of votes by a certain timeframe, it gets moved to the appropriate category in the public section.
I'd imagine it's possible to do this manually. The news module has a statistics section in its admin area for each story.
One thing you would probably have to do is set up a Waiting Articles block on the homepage that is visible to everyone, but accessible only to registered members for viewing and voting.