The Omni controls consist of a VisAD Spread Sheet, loaded with the parameter selected and its coordinates and units. The Spread Sheet is used to create a display where you have complete control over which coordinates are the axes, how it is colored, and so on. Use of the VisAD Spread Sheet is not described here. See the VisAD Spread Sheet document at http://www.ssec.wisc.edu/~curtis/ss.html.
Many of the menu items seen utilizing this display are standard options that can be found in the Menus section of the Layer Controls page. However, there is one option that is unique to this display.
The Edit menu has this unique option: