I now have the Prefs system for the OPML Editor working once again after the changes in styles, and using the Bootstrap library from Twitter. The new look is much better, and there's room for a lot more functionality.
From the inside, the new prefs system is in prefs2, and corresponds to log2, scheduler2, river2, radio2, etc. A revisit of something core to the functionality that has been completely rewritten in the last few years, but is backward compatible with previous versions. This runs the same outlines as radio.prefs, but does it with much better use of fonts and CSS and no tables.