*Disclaimer* These are just my thoughts, posted here to get feedback. I have no intention of anything negative towards whoever setup the current systems*/Disclaimer*
Currently ISPConfig uses SVN for version control which is awesome. Would it be possible to setup a subdomain for ISPConfig that is running Trac? I have used Trac on my own projects and with many other projects as well and it has some really great features above and beyond what FlySpray currently offers. Two of the additional features is that it integrates a wiki(which is really easy to add content to), and it also allows for easy viewing of the source code from a browser.
I would be willing to help setup trac on a subdomain of ispconfig.org to show off the features and to see which is preferred(Trac or FlySpray). I'd even be willing to help move some of the bugs from FlySpray to Trac. I'm thinking that it could be a ISPConfig 2 is on FlySpray and ISPConfig 3 is on Trac.
Here is an example of Trac in action. FreePBX uses Trac. FreePBX also has a online module management and installation ability.