While I do love the chance games, they take up too much screen space and distract from the stream. Yes I've had clients complain about this... it looks like I'm trying to host a game show...
I would love an option to basically shrink the game instructions down to an icon, so you know it's running and only show the bulk of the game, dice roll, spin wheel etc when it's actually running. This would also allow multiple game options to be running simultaneously.
The same with the running goal. I would love for a progress bar style with a custom celebration gif option. Subtle but lets you know that something is happening.