Custom Gradient is misnamed, should be "Render Gradient"
The plugin in /scripts/gradient-example.scm shows up in the popup menu of the Gradients dockable as "Custom Gradient..." This disagrees with the blurb: "Create an image filled with an example of the current gradient." This seems confusing: if a user actually wants to create a "custom gradient" (meaning one they made themselves) there is another menu item "RMB>Gradients Menu>New Gradient...".
Maybe "Render gradient.." makes more sense.
Also, the blurb could be shortened to "Create an image filled with the current gradient." The phrase "example of" adds no meaning.
It is in ScriptFu, but its a GUI or human interface issue someone else should decide.