Err.. Ahemm... Exuse me? I didn't say you needed to map to that single share, only that you don't need to setup thousands of freaking shares! The days of all those hidden shares are gone with the old Wintendos!

Often, in larger organizations, there are several authentication systems that each have their limitations and unless you deploy an expensive single sign on (SSO) system, you will have to come up with a standardized UserID that fits the lowest common denominator. I think many organizations go with First initial followed by X number of chars of the Last name followed by a numeric sequence in case of duplicates.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.