I have been using JFaceDBC for a while now, and when it went commercial, I was happy to pay for a licence for its use (its an extremely decent tool – as I’m sure you know, since I assume you took the last public branch to add into the ME project).
However, when I uninstalled ME, it also took my JFACEDBC libraries. I highly suggest that if you are going to integrate the old libraries (and/or modify expand them), you rename them so as not to collide with another commercial product. If I am mistaken in that assumption, then the problem is even more annoying that the uninstaller would remove the jfacedbc directories from the plugins.