With Beal it depends which dry treatment the cord comes with most come with drycover , which is only the sheath that is treated, but the goldendry is a full on treatment in and out.
Only thing that is a drawback with the skinny single cords seems to be that the sheaths arent at thick at most so they wear pretty quick compared to say a 9.0 rope designed to be used as a half.
The Beal Ice line can be used as a twin or a half, that was the new BD catalog states. So if you go with doubles or twins these are nice cords. I have a pair and they are great, they are single pick also, which is nice.