Thanks to a few people that gave valuable feedback and myself, I have many improvements planned for future versions. Among them are user roles, since the permissions are growing and it's getting hard to manage permissions for each user, a dashboard page that will replace the project list as a start page and improvements in notifications that should allow you to recieve just a digest message via RSS (or possibly email in the future) and see the whole bunch of modifications, no matter how large in Narro, nicely paginated.
For those of you using l10n.mozilla.org installation, note that lately the machine is slower than it used to be, other installations are just fine. I recommend that you find a place where you can keep your own Narro instance if possible.
Regarding integration with versioning systems, it will have to wait a bit, at least one version, because I need the features described above for the projects I'm translating. Remember, I actually translate, that's why I'm writing this application.