CargoOne,
If you change that to HUGE MTOW penalties, you'd be right on the money. Have done quite a lot of CPH-FAE flights for Maersk, and can hardly remember one where we didn't have to off-load cargo or mail in order to get the paperwork legal. Going back from FAE to CPH matters only got worse.
Atlantic Airways also operate CPH/FAE with a 146, but are still experiencing payload restrictions.
RWY info:
Roskilde
11/29: 1740M
03/21: 1500M
Vagar
13/31: 1250M
However, the runway issue will not be the major drawback. The lack of suitable facilities for passengers will be the major hurdle, and I don't see Copenhagen Airports investing in a new terminal to accomodate Easy, or any other pax carrier for that matter.