Have you considered releasing this on
GitHub so that other people might Fork it? I'm sure there are a few people out there that might want to try and add mumble support.
I myself, read the thread that you posted too with the devs saying that you have to use CVP or use an Ice module for PHP. While I understand that you don't want people to have to install Ice (I don't blame you at all, I would hate to add a dependency to this) I don't see the problem with parsing the CVP string using the included
JSON parser within PHP. Seeing as vB4 (That this Add-on is targeted at) has a minimum requirement of PHP 5.2 anyway I don't see this being a problem.