Igor - I cannot believe your reply - it shows a complete lack of understanding of both the term "upgrade account" and how customers want to operate.
The more I read about what Parallels are and are not willing to implement / redesign in their systems, the less surprised I am that cPanel and WHM is the world's most popular control panel. If I was a shareholder, I'd be calling for the CEO's head for completely ignoring the trends of the industry and the requirements of customers.
Does anyone at Parallels audit these forums as a source of customer requirements in your products, or is development controlled solely by what the technicians feel like attempting?