When I run Options command and improve the quality of Rhino render mesh, this change has no influence on default quality of the zebra mesh. I believe that the quality of the render mesh should influence default quality of the zebra mesh.
I also believe that simple controls of the zebra mesh should have greater influence on the maximum edge length.
By the way, Zebra command does not work well on SubD objects in Rhino 6 and Rhino 7 - it is impossible to change zebra mesh.