I'm going to add a slash command in the next release...
/nui boomkinbar
In nUI5 to support this behavior. By default, the boomkin bar will be enabled to it works the same way the Blizz bar does. However, the `/nui boomkinbar` command will toggle that behavior on and off.
I'm not sure which way I'm going to deal with it in nUI6 yet. I'm interested in feedback from the community on their thoughts on this.