I am not sure if anyone ever suggested this, but one thing I would like to see in both Band in a Box and Realband would be a numerical bar count indicator to note a change. For example if a song is primarily 4/4 time, if I had to add a 2 beat bar I would like to see a small 2 beside the bar number. A 4 would then appear at the next bar number when time went back to 4/4. This would be especially helpful in Realband since I use Realband for live work. I wouldn't have to try to remember all the various bar count changes.
(I have enough trouble remembering lyrics!). Yes, I do use the comment window for lyrics.