To get the chord change in the correct place above the lyric like Twinkle I think it needs accurate lyric placement.
I haven't played with the bar based lyrics, but I don't think they are accurate for chord/lyric sheets.
I just remembered last time I went to put lyrics in it was so slow one event at a time it put me off frown someone else might know a better way ???

Here are some other tools that may help.

http://www.statistics101.net/chordsmith/
https://sourceforge.net/projects/chordii/?source=directory