Action Runtime Settings can be edited in Settings - Runtime Settings. As a convenience you can edit the settings for a specific item via the Edit Runtime Settings context menu item in the Action Manager. A folder or action can be selected. The name of the selected item is always used as the name of the runtime settings set.
A panel will open displaying the settings for the appropriate action in a text format. If the runtime setting set does not exist, the text field will be empty.
Empty lines are ignored. All other lines must be of the form:
name=value
The name field cannot be empty and cannot contain # characters. The value field can be empty.
When the panel is closed with Save, the runtime setting set will be updated. Note that if no settings have been defined, the runtime set will be removed, if it already exists. This is different than the functionality in Settings - Runtime Settings which allows empty sets. There is no benefit to an empty set.
Note that not all actions use a runtime setting set. Further, it is possible that actions use sets other than ones with the same name as the action.