Thanks for the suggestions. I failed to say that at this point I am just creating the footprint for the switch, and so only have available those tools in the footprint editor. Of course the footprint should be created as a 'normal' part, with the customary silkscreen, fab, and other layers. The place to worry about the dashed line is in pcbnew, where it will be mirrored. I can then place any special silkscreen art as required. I can't use arc circular array method because my computer is an old XP whose graphics card only support the default and Cairo. I know, past time to upgrade! Maybe a series of carefully placed arcs, or if all else fails I can just leave it as a solid circle.