Steelers apparently content to carry $18.895 million cap number for Roethlisberger

In recent years, the Steelers’ annual game of salary-cap limbo has included a restructuring of quarterback Ben Roethlisberger’s contract.  But after three straight years of converting salary to signing bonus in order to drive down cap numbers, Roethlisberger has only two years left on his contract. What’s that, you say?  Can’t he do an extension…