Wow, really nice and thank you for your hard work!
I gave it a try and while the plugin is very useful it has some glitches:
1. For some reason it moves down every time you hover the mouse (even in Ctrl+\ mode is turned off), so the plugin can easily go out of game window space without your notice.
2. I've got a bug when new 60% red buff appears on the same level as old 30% blue buff. As a result both bars disappear soon while you still have some seconds to renew 60% buff. I've found this bug while doing quests and couldn't reproduce it on the training dummy later.
3. It would be very nice to have opacity percentage setting in the plugin options.