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.
From a purely moral standpoint, I think refusing to pay inactive addresses is wrong. It's due payment for past work, it shouldn't be pushed back indefinitely. It also punishes the creation of new addresses, which beats one of the selling points of mining here ("virgin coins"). There is already a "new address tax", there shouldn't be any more.