Personally, I draw a portion of a straight wall the same construction as the curved wall adjacent to the area I want to snap the roof to rather than a beam ... I find it easier to keep straight in my mind, it also means that the overhangs (and heights) are consistent. Then change it to hidden (I also put it on a hidden layer), remove from cleanup, uncheck extract in model and uncheck include in softlist. Don't delete it or you may cause issues later since the roof is no longer referenced to anything.
You can move it laterally away from the curved wall and still keep the lollipop referenced to it even though the lollipop is no longer connected to the roof. It's also useful if you have multiple gables as Softplan doesn't like reference multiple roof edges to the same wall in certain circumstances.(I've just found out that this is obviously not one of them).
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You can actually "remove" roof edges (or any polygon for that matter), by creative use of the INSERT POLYGON EDGE tool.
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