In order to define a contextual action for FK layers, you need to put your Python script in your Python directory under a directory called Contextual_FK_Display_FK_Layer.
Go to Tools->Options->Environment->Python Scripts (or Tools->Options->Python->Scripts in INTViewer 5.2) and click "Refresh from Disk". Your script should be listed automatically.
You will now be able to execute this script from the contextual menu of the FK layer:
This script will alter the trace spacing and normalization limits of the FK Layer, and then change its color map.
This script is attached to the bottom of this article.
The result after the script executes should look something like the following: