We have a Django installer in Virtualmin (maybe only in the commercial version, but I think we tend to put "developer" tools into the OSS version, as well...so it might be in all versions; there's 100, or so, installers in the commercial version and only a handful in the GPL version). I was unaware of Django CMS, and no one has requested it, as far as I know...we pretty much build what our customers ask for.
We welcome community contributions of installers, and those always go into the OSS version of Virtualmin, as long as the person is willing to help maintain it long-term, and it is generally usable on a wide variety of our supported operating systems without too much effort (e.g. it works without needing a super new version of the language). Adding such an installer does put the app in front of about 100,000 users (which is roughly our current installation count of Virtualmin GPL), so that's cool and probably is a useful use of time/effort for someone wanting to make a web application more visible and more widely used.
We're working on better support for multiple versions of Python, as that's also a problem for more widespread adoption of Python apps (and Ruby, and Node, and Perl, etc.). Most rely on very, ridiculously, new versions of the language, whereas PHP apps almost always have a low barrier to entry that matches what an old version of CentOS shipped with. So, users don't just need to install the application or framework, they also need to install a personal version of the language it is written in. That's a bridge too far, for the vast majority of beginners. We already support multiple PHP versions, as that was a priority for many of our users, but we're just getting started looking into stuff like rbenv, plenv, pyenv, etc. for private versions of languages.
The problem of needing very new versions of the language currently leads to a lot of our supported non-PHP apps being unsupported on the most popular systems, without some extra hoops to jump through; CentOS 6, which still has more active installs than anything else, can't run many modern Ruby, Python, or Perl applications, without installing a newer version of the language. SCL provides newer versions of some of those, so it's not insurmountable, but it's still a leap for many non-technical users.
Anyway, it's worth being aware that using the latest and greatest language features is fun, but it's also limiting reach. (Even once we automate all of this for other languages than PHP, Virtualmin is still running on a tiny number of the servers in the wild, relatively speaking.)