I just thought about something.
codeblocks' forum, wiki and website are on which server?
If you can add things yourself, maybe you can add it a software forge, so you could choose every tool you want to use? And there are plenty of forges that support more than one VCS. And maybe there is one which can handle synchronization between 2 hosted forges, solving the problem of using git OR mercurial OR subversion OR ....
At least, in this case, it could be possible to have SVN+GIT, or SVN+HG, or any other combination the C::B team choose.
I would like to say that it is a way to "ménager la chèvre et le chou" (I'm not able to translate it, I'm sorry)