Hi,
I don't know who are developers; I don't know if they read this forum or not... But form my experience as a developer, even if the project is not open source then using CVS, or another version control like Subversion, is a big win for the project. So I would recommend that anyways.
About open source: I'd like to see the project open-source too, I'd love to have a look at the source and if it can be compiled with a compiler available to me, I'd love to make contributions too. (Even if my time is really, really very limited...)
greetings,
--Tim