Well, although the Set as Home Thought option is not displayed with right click on a tag thought, when using the keyboard accelerator for 'Set as Home Thought' a tag can indeed be so defined! I don't know if this was always available or it was added but it is very useful, thanks.
Only wish I stumbled on it a couple of years back. For consistency it might be useful to have this visible on a Tag's right click menu.
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