Possible to change default units from mm?

Is there some way to change the default model units on new documents to something other than mm? Also, could someone explain to me how “Page” units are used? I don’t seem to find any documentation on them.

Not until a template file start up system is put together like Rhino for windows has. Then choosing a different unit/tolerance template will be possible.

Page units are meaningless until the Layout feature is added to Rhino for OSX.

There is no formal Rhino for OSX documentation yet.