Extend with longer characters for rewrites

It would be nice to be able to redo the whole song same voice, same beat when we need to. Extending to 5,000 characters to extend in case the majority of the song you want to rewrite or the whole song, not really just extend but you liked the voice and beat but it’s missing something or mispronounced the words. So having way more than 1,000 characters would be great! Or another category for that all together.