I’ve found a post on ubuntu-fr forums about tilda with true transparency, wow :). This point me to this article with a link to the patch and a deb package. I tested the package which worked fine on gusty, but update manager always wanted to upgrade it.
So I took the patch and use the (almost) same apt-build method that I used for the mac menu, and I build a tilda package with a superior version number (the trick is to add a changelog section to deian/changelog).
here is the package : tilda true transparency
here also is the patch I’ve used : tilda true transparency dpatch (note that it is only for use with an apt-build method or a deb build method)