Comments in-line:
Ok.. Github issue filed. As for the de-emphasis point.. wow.. thanks for that. I didn't think to look at the "..." button. Maybe that could be relabeled something like "Opts" to be a bit more intuitive?
Beyond that, I'm going to have to research how a parameter with units like microseconds map to functionality like pre-emphasis! Maybe you have a good URL you'd recommend to start off with?
HTH
--David