I'm a streamer myself and I feel like the best opportunity for exposure is through clips. By allowing new users to view clips pinned by the streamer and voted for by the community, it exposes new viewers to existing content.
How It Works
The broadcaster has the ability to search their clips and feature them on their channel. The viewer is then able to select and preview the clip, as well as "like" it. Likes accumulated on a clip will boost it's popularity, and will boost it's rank in the extension.
This allows community members to curate your content to new viewers and engage with your community.