On that page, it said "we invite you to get involved". Well, I have one single comment for MT5. Other than my comment, I'm quite content to take the software as it comes. Having said, that..
LEAVE THE PRICING AND LICENSING ALONE!
It seems that ever major revision, there's some "great new" pricing and licensing scheme which seems to piss someone off. I suggest leaving it the way it is right now. It seems to be working (since I haven't seen complaints about it), and to change it, making it more restrictive would probably be a bad thing.