I'm sweeping the cob webs out of my brain and trying to remember working with a free program called "Kar Play" It allowed me to edit lyrics in .kar files. In order to do this you had to be brought to a page showing the lyrics. (Copy,Paste) If MTU does get around to adding the suggested new features, that's great. However, I bet that the real Midi Karaoke Players will be accomodating if you poke and prod the program.
If you need more info or would like to straighten me out feel free to PM
Good Luck