SEIFR is a commercial matter only, private ops have no special limitations to my knowledge.
Commercial:
Isn't it still allowed (in the UK) to fly IFR during the day, as long as there is 1 mile vis and 1000 feet ceiling at both destination and alternate ? Cargo only, of course.
In Scandinavia there are no limitations for SEIFR, except cargo only. But you must have an approval for it. And set up contiguency enroute procedures.