In my second-hand experience, this combo swivel stud / forearm attachment screw is a better idea in theory than it is in practice.
I write "second-hand experience" because my son picked out the Rossi "Matched Pair" in .22LR for his first rifle and ninth birthday present. When he carries the rifle with the shoulder sling attached, the stud / forearm attachment screw invariably gets loose. He's only actually used the sling a few times, though, and others may not have the same issue. That said, it seems to me that divorcing the two seperate jobs with two seperate components, as is done in a Handi-Rifle, makes a lot more sense.
-JP