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Here my $0.02:

240 wagons were not available with a factory sunroof. Volvo believed (in their conservative, play-it-safe manner) that because the wagon structure was weaker with respect to the sedan, the roof crossmember (roughly across the tops of the B-pillars) was too important to cut/remove for a sunroof installation. A sedan has the banefit of the bulkhead behind the rear seat, the panel under the hatshelf, and the shorter cabin area which makes for better torsional stiffness. There is some debate as to whether or not a sunroof actually weakens the structure - IMHO, it does, but not so much that you'd notice - unless you're pushing the car all the way on a track.

Aftermarket sunroofs have a really bad reputation as far as developing leaks - but I can't confirm that as being fact.

No 240 was ever offered from the factory with a power sunroof to my knowledge. BUT, there was a little-known accessory/option to make the sunroof power operated. It came with a rocker switch that mounted in the center console, and it had a pictogram of a car with an opening sunroof on it.