Nefario, is suggesting that if the double spendings are not returned then your account info will not be included in the asset information/list until the payment is sent back.
Idea: for those that refuse to return the double payment I think Nefario should change the payment address to one he controls and collect the dividends until he is paid back, then change the payment address with the asset issuer to the original address so that the remaining dividends go to the customer who refused to return their ill gotten gains.
Good idea, I will suggest that next time I talk to him.