The legend paging that was implemented works well for vertical legends, but not for horizontal legends. In the case where there are many plots on the same chart, the paging buttons take up too much vertical space on the chart, they should be floated to the left or to the right, or the legend should become a "scrollable" object to avoid this issue.
P.S. Another issue is that the legend has some clipping issues if there are more than 2 or 3 pages.
This can all be seen here: http://jsfiddle.net/GEZ3m/