I want to give some unsolicited advice and suggest that you charge different prices for indie vs. studio licenses. I've already used tyFlow to save my company several thousand dollars over doing the work via pflow or by hand, and I know that my company would shell out a decent amount to have this tool in our pipeline. You deserve some good cash for creating this, but I also understand that it's ideal for this tool to be affordable and accessible to everyone, and an indie vs. studio price model seems like a good middle ground. Anyway, there's my unsolicited advice.
He should only create 2 versions of Tyflow.
Free, and commercial.
The free version would include some annoying stuff from PFlow (50% of viewport particles, 100k limit by default, cache limit by default...), and everyone would buy commercial version.