Lyric syncing

The Good

Things pretty much work as expected for anyone who's synced in any other karaoke creation tool
The lines that are too long are marked really well. It's much easier than going through each page and checking if the line goes off screen like certain software. It would be cool if you could go a step further and warn about text that's going to be smaller than the "normal" size too, so people could ensure they have consistent size if that's what they want on their video.
Keyboard shortcuts - Thanks for having shortcuts for redo and slow speed, they're really helpful. One nice little addition would be if hitting backspace again goes back a previous line.
Being able to click back and re-time a line is cool.

There's nothing warning that editing a word will clear out all the timing. Ideally, editing a line should only require redoing timing for that line at worst, but if there's not a good way to implement that, there needs to be a warning. Although, realistically, if a word in the lyrics needs to be corrected, there's no way to avoid editing it, warning or not...
It's not very ergonomic to fix timing. To even know you got it wrong, you have to go to the next page, play the preview, then go back and adjust. Even then, you're listening to the instrumental version which is going to be harder to match up. Hopefully the Edit functionality later will fix this.
I know you mentioned there will be a way to import timings at some point. There should also be a way to export timings, or even the whole project configuration in case it needs to be updated in the future.