The source code repository is actually one thing I wanted to bring up with you, Hugo. I think having a publicly-viewable repo in very clear view on your home page would be a good thing, and reassure people that you're utilising peoples' contributions/bug reports/etc. I think it would drastically change many potential users' perceptions of the likely longevity, and, as Thomas said, its vitality.
You would still remain in complete control of your online repo, of course, as you wouldn't give others write permissions. If this was at Github, they would submit pull requests which show you what their changes are, and you'd then discuss/accept/reject. Here's an
example of a pull request [github.com]. (Sorry if you knew all that already.
)