Roar is wanting the FFA to give them a cap exemption, so they can re-sign Berisha. They are also looking at having one of their owners clubs (Inter Milan) sign him and loan him to the Roar, so they can pay him more outside the cap. Roar's cap would only be credited with the amount they pay Inter for his loan.
Now that's a sneaky move - potentially this could work for them if Inter Milan pay him a decent wedge and Roar loan him back within the cap. Interesting precedent if they do that. As I understand it though Inter Milan and Roar are not owned by the same person. Roar are owned by Bakrie Group and they have close ties to Erick Thohir who owns Inter.
Extending the cap for them would just be plain unfair though. I can't see any reason why FFA would do that, especially since there's reportedly offers for him from other A-League clubs so it's not like the league would be losing him.
Also there's rumors that Berisha wants to go back to Europe to be closer to his family...