Custom emotes on the hype train.
Explanation: The rewards for participating in the hype train are standard Twitch emotes. The idea is that if the streamer can add some extra emotes there, users might be more encouraged to participate.

Be able to use bits for rewards instead of channel points.
Explanation: Users who don't have enough points (or even those who do) could choose to redeem a reward for points using bits instead. Or the streamer could choose to have some rewards exclusively for bits or only for subscribers.

Add some Bit-based games.