Consistency is a good thing. Space delineated lists have been the
standard for commands since 2009 or so, it was an oversight that
buildiso went that long without being fixed.
It does need to be updated on the wiki, and also it should be added to
the "What's New in 2.2" (if I'm remembering the wiki page right) so
that people upgrading know about the change. We'll take care of that.