Personally, I'd rather see those arrows re-enabled and the underlying bug fixed more elegantly. Each time I add a new artist, I have to re-order the artist up higher in the list, often having to traverse multiple screenfuls (each screen is a separate drag operation because it won't auto-scroll the right hand pane when I drag to the top). So I agree its current behavior is non-optimal and I, too, would like to see it changed someday.