Should have been more clear: I do the sole edge at the same time I do the uppers, and since my regimen includes both cream and wax I use both on the sole edges. And you're absolutely correct that cream does a way better job covering over scuffs.
I'd be interested in learning about more sophisticated edge treatments such as the "glassing" you mention above.
Its not for maintenance. Stick with diluted dyes or shoe creams.