Update...
To add the addons under the "LAVA>>UI Tools" palette, I've needed to create a UI Tools palette package that will install through LVTN. My submission has not been done yet for this addition, so it will be a while longer before I post an update for the Tree-Tagging addon. Failure to do so would cause multiple UI Tools palettes to appear side-by-side in the LAVA palette, which is terribly bad style . The good news is that is works well and will allow me to integrate more addons that way in the future.
I'll be reviewing all the comments I got on this addon, make modifications and tests, and I'll submit it whenever I'm through with the LVTN submission. Since your solution works in the meantime, I'll leave it at that for now.