XenFans.com has decided after a review to open this thread and provide support on xenforo as well (due to the nature of this particular plugin).
A new version has been released with a significant update including 30+ changes. Previous features, bug fixes and the ones for this release are documented in the .txt file of the second post (above this one).
version 1.0.4 build 5 for xenforo 1.0.4 also works on xenforo 1.1.0 beta 2.
The only thing that appears to be broken is the missing class importantMessage, since it's replaced by the notice system - a future update will address that obviously.