Picture the scene(s).
Two churches, one with a huge projected screen, one with a not-so-huge screen. The one with the huge screen is a church (or at least, for church meetings) with a large number of young people attending, the one with the smaller screen a church with a more elderly congregation. Therefore the two different venues need different themes, one with a larger font size than the other.
A lot of the songs in the database are shared between the two churches. There are two problems with this particular scene, and that is when verses or lines split over their respective sections.
Now, the verses bit is fine thanks to the [---] deliminator to give the 'soft' split over lines. 
The second part that would be useful is a 'optional line break' deliminator which, if the line splits over two lines. Much as I hate Easy Worship, one thing it does have in its favour is that it 'smartly' puts line breaks in, mainly to avoid orphan words - admittedly it doesn't do it that well sometimes, but it does do it. A lot of songs that have long lines have 'natural' breaks in the lines, either in the rhythm of the song or in the actual structure of the sentence where it would be good to put a line break in. I could put a break in here, but often it seems as if on a larger screen with a smaller font, it looks odd having short lines in the middle of the screen. (I hope that makes sense!)
I know that it's something that could be solved by HTML, and I'm currently looking for what HTML tag may be able to do this, but I can't seem to find one at the moment. I don't know how much work would be needed to make this something OpenLP could handle natively if it's not something that can be done by HTML, but here's hoping!
Sorry, I do tend to ramble sometimes...
FOOTNOTE : Another slight issue with this is that sometimes you might want to put more than one [---] in, but the way the song goes it would be useful to specify which one of the [---]s has priority in the song. But that's not really necessary, just would be nice. Actually, any feature request is more a 'would be nice' than a 'necessity' but there we go. I'm rambling again.