Freddie Mac recently rolled out a new REMIC deal that officials with the government-sponsored enterprise believe should give the company more flexibility in the types of loans it can handle. The first-in-its series deal, 05S001, was backed by $4 billion in option ARMs in whole loan form and is considered a pilot project. It was made up of two structures: $3 billion in mortgage pools fully guaranteed by Freddie; and a separate $1 billion structure