Hmm. I'm uncertain. Afaik the ROM should contain the Swedish mapped keys. As I said according to the salesman Samsung are having trouble with the 7610. I would suggest the following:
Contact either the point of purchase or Samsung directly and report a faulty unit. It's their obligation to ensure it works properly. If not, demand a refund.
The magazine Mobil in their latest edition tested keyboard phones. The B7610 went up against the HTC TPII, Nokia N900 and many other powerful phones, and it received the highest score. Why don't you contact them and ask what ROM their unit was running - as apparently their keyboard must have been working for it to win the test. You could also report your problem to them. If they publish news like this, Samsung may react and rectify the situation.
Sorry I couldn't be of any further help.