@Emil Update the SDK to expose the new Twist event handlers. This would allow the community to start building solutions. Seems like a lot of functionality for fairly low effort.
Native HomeAssistant integration would be my next priority. Focusing on the generalized API offered by HomeAssistant (i.e., device classes) would be a lot easier than trudging through the peculiarities of each manufacturer's platform. E.g. light brightness is just that, and the API exposed by HA abstracts away whether it's LIFX, IKEA, Nanoleaf, Hue, etc under the covers.