Honestly, if pushing out a beta of Plus! just because people who are using the 2009 WLM beta want it, and then all the effort been ruined by a new beta which makes Plus! incompatible again, im willing to just wait it out until a stable final release of 2009 WLM to be released so that we can be sure Plus! will be compatible with it.
In short: Dont give out a new beta just because a handful of people want it, some things are worth the wait.
EDIT: i just realised this post hardly makes grammatical sense, but try your best
. The consequences of me staying up late and posting =_=