Not able to adjust swatch properties within a gradient

I am not sure if this is a bug or if InDesign is just lacking the simple and clearly self-evident ability to apply tints to swatches used within a gradient—the same way you would with a solid color object. 

When I select a node from the gradient bar to which a swatch color has been applied, the tint bar is greyed out. The only workaround I've found is to convert the swatch to CMYK/RGB and shift-drag the sliders to try and maintain hue.

Has anyone else been impeded or annoyed by this?

Is there a reason for the absence of this ability?