I've fixed it in my development version

Thanks. Look forward to seeing it. In the meantime, I will work with the hack I've described above.

It might be nice to have customizable line-element formatting as there is with blocks

Yes. That, or some way of overriding existing methods or adding new methods. For example, besides highlighting, I also use strikeout and cleaner external links. If I depend on just T::W, an external link has to be written as [http://some.link.com] or [mailto:some@link.com] while I want to accomplish the above without the square brackets, and not have the URI scheme display.