Possibilities I see:

• Send to the Bitcoin key on the Namecoin network (ie, key export/import) on demand
• Require miner that can send a long username
• Provide a web interface for account options (including Namecoin rewards and changing minimum payout)

I like the lattemost the best
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I would still like to see option two.  It keeps in tradition with having minimal interfacing with the website.  Just point your miners and mine, no accounts, log-ins, etc...