I'm answering this as another ISV, maybe someone from Jive can chip in, too.
First of all, you might want to join the Jive partner program (http://www.jivesoftware.com/partners/) while this has a cost associated with it, you get your own development systems, and can even use Jive in production within your organization. I think you are based in Canada, so Albert Caravelli is your partner contact.
"Real" ISVs are still a new breed for Jive, and while they have gotten a lot better, the sales organization is not a good audience for a first approach (unless you have existing joint customers or solid leads).
Feel free to contact me should you have further questions,
thanks for taking the time - much appreciated and "dankeschön" :-)
We'll contact Albert, then and discuss our options!