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I agree that the easiest way is to build in SEO features to your submissions. Making sure that the title translates into an H1 tag, etc. One of the reasons why YouTube became such a success, pre-Google purchase, was because every time you upload a video to YouTube, you do some SEO work: tagging the video, upload a transcript (if prompted), adding a description, etc. If you make the user interface easy to do this, you'll be ahead. When it comes to complex schema data, I wouldn't worry as much. Most forum/article submissions rely on long tail traffic. Spend time optimizing the best traffic drives or the pieces that get the highest social shares, which might also work great on searches. It's okay to cherry pick the work when you don't have time to do it all.