The Emissive material settings are organized in Basic and Advanced modes. Switch the mode from the toggle button under the Preview Swatch or globally from the Configuration rollout of the Settings tab.
The Add Layer andAdd Attribute buttons are provided for some V-Ray materials, including Emissive. For more information, see theAdd Attributeand Add Layersections.
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Holding down Ctrl(or Cmd on macOS) while while having the Add Attribute or Add Layer menu open, allows selecting multiple entries without closing the dropdown.
The context menu of the Color slot provides options to Copy and Paste, as well as to Reset the color.
A Reset option is provided in the context menu of each Number Slider.