The ruler objects for horizontal and vertical are distinct so can be individually controlled. But not sure if the hooks needed to show or not show one or the other exist to tie to a context menu action.  

If so, should be an easy, and worthwhile adjustment. If they can't be shown/hidden independently, it would be more involved.  But worth a look in either case.

Lets see if we can get some evaluation by a dev with some code pointers.

(In reply to Jay Philips from comment #0)
> The context menu would ideally need two entries - 'Disable Ruler' and
> 'Disable Rulers'.

Please don't have just the plural form affect the functionality. A simple context sensitive "Hide ruler" would be cool however. Perhaps "Hide horizontal ruler" and "Hide vertical ruler" to make it clear.

(In reply to Heiko Tietze from comment #3)
> Please don't have just the plural form affect the functionality. A simple
> context sensitive "Hide ruler" would be cool however. Perhaps "Hide
> horizontal ruler" and "Hide vertical ruler" to make it clear.

Have to revise my first assumption that we'd need two entries, as other entries in the context menu only effect the selected ruler, so only one entry is needed. Yep 'Hide Ruler' is better than 'Disable Ruler' and would result in less translation work.