That does indeed work, but its not consistent since the ctrl modified offset still works on multiplayer games for changing scroll speed. Also I might be wrong, but I believe you used to change offset with shift or alt in pre-song as well, and now you can't change off-set at all with this change (or at least I haven't been able to).
This is personal opinion but I use both the in-song and pre-song scroll speed changes and having to use ctrl + F3 / F4 is pretty bad and uncomfortable, whereas just F3 and F4 during song (well start of the song since you can't afterwards) is pretty decent because it doesn't take your hands too far off from your playing keys or put them in a weird position. I now have to basically choose between bad or bad, because my options have been limited, where I really liked the old setup.