Amergin, get hold of Noteworthy, it has a gizmo that allows you to fit lyrics to tunes!! and you can (by using hyphens ) spread a syllable over several notes too, I am finding this really helpful as I dont play instruments and often write words to existing tunes.
With your specific problem, if you have different numbers of syllables in lines in different verses , simply copy the tune and add the different lyric/verse to the copied tune!! It works!