Rviz: Howto set radius of TF frame axes? (not Axis axes)

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Hi all,

If you add an "Axes" to Rviz, it's possible to set the length and radius of the RGB-colored axis. Hower, if you add "TF" frames, you can only edit the marker scale (combined length and radius) for all frames of reference.

I would like to customize the display of the axes for each link frame (TF) e.g. increase the length, bbut decrease the radius.

Has anyone figured out how to do this? including modifying the Rviz config or background code?

Thanks, David.