WipperSnapper does not currently support components that communicate over SPI or UART. It may in the future, though!
We have future plans for I2C output components - but they are currently not implemented in WipperSnapper.
WipperSnapper does not currently support analog output components. It only supports analog inputs.
You may request a component to be added to WipperSnapper by navigating to the WipperSnapper_Components GitHub page and filing a request for a component type. Please be descriptive as possible, and include any libraries/documentation/URLs you may have. Requests have no ETA regarding when they will be implemented into WipperSnapper.