One of Eligius's advantages is that you can create separate little stashes of 'virgin' coins. I would have thought this an appealing point of differentiation for Eligius against other pools.
If you have to mine to a single address and then transfer coins on the blockchain - you tie these stashes together in the public record.

It wouldn't bother me if payout to inactive addresses was low precedence and slow.. but it should be automatic and complete.