As long as you keep it opened here or in Github, your script is THE solution for the integration of DEVONthink and Tinderbox as far as I am concerned.
Unless they are real footnotes, I keep my sources solely in DT, referenced as web links in the $Text of my annotations. Therefore, the watched folders feature has ended up being less important in my seutp.
I use Tinderbox mostly for my own writing. With your script I can have it in DT as well. I am still to decide if in the same DT database as sources or in a different one.
So, thank you very much for sharing your script.