There actually are UV mapping controls in Mac Rhino like those found in Rhino 4 on Windows. Check out the commands beginning with Apply like ApplyPlanarMapping and then use MappingWidget to see and edit the mapping. Another command that is helpful is MatchMapping. All of this is lacking a UI however so it’s understandable to not know it’s there.
What UV tools do you want to see in Mac Rhino? The exact same as Rhino 5 for Windows or do the primitive options from v4 work for what you need?
The default UV mapping method for all surfaces and polysurfaces is by surface domain. In the case of a polysurface, each surface within it will get the texture in the material mapped to it’s U and V coordinates respectively.
If that doesn’t help, can you make a new topic here on the forum and upload a file to explain your question?