Consider this sample program:
p1 = Paragraph('This is a paragraph\n'*10, styles['Normal'])
If this is reportlab's paragraph class, the output is 2.
With wordaxe's paragraph class, the output is 0 because split() alwys returns 
This is a rather small problem for me, because it only hurts rst2pdf when there are list items which contain a paragraph that is longer than a page, but I am curious ;-)