One thing that would greatly increase usability and readability of songs is to be able to mark a measure as Skip. Similar to Part Markers currently, but instead of Blue or Green, may be Grey to Skip a measure and Black to End the song.

If your like me I use Band In The Box to create lead sheets and work out songs. If I could Mark a measure Skip, then if my into has 3 measure and my versus has 8 measures then I can make my song more readable while working on it. Something like real world...

Intro
Verus
Chorus
Verus
Chorus
Ending

As far as Lyrics let me insert a Lyric line above the current Measure line and break in down into the same number of measures but allow free text entry.