Note that 'Hardware Texturing' in Maya's viewport will only work when using a Maya file texture with the Ai Skydome light. Using an Ai Image, for example, will return black in the viewport.
The size of the sky in the Maya viewport.
The direction that the Color texture map faces in the viewport. Can be set to Front, Back or Both.
Currently, the Ai SkyDome light will not appear in the light linking window. A workaround is to use the defaultLightSet to change light linking options for Arnold lights (make sure to refresh the IPR when making changes in the light linking window). A video demonstrating this process can be found here.
The Skydome light will not work with Atmosphere Volume. You must use regular lights that have a precise location and size, and inverse-square decay.