Thank you for your support and answers Jeremy! I really hope, I can find a solution for this, because Jetpack has really awesome features on board, that I like to give to my clients.
My opinion and judgement is not about the new features, it's about the idea, that a plugin upgrade is only motivated because of the new features. Jetpack's new versions are fixing bugs and making the existing features more polished or stable. This is the first reason to upgrade Jetpack plugin or any plugin.
So if somebody (even if he is Matt) says, that a plugin upgrade is only for the new features, it is not a good advice. I think, you can agree with me in this.
Can you say, that it is safe to use Manual Control Plugin? I mean future proof? Because I have to care about hundreds of client websites.
I have my own plugin now, which I use for custom css, social sharing, shortcodes, etc. But it would be good to use a plugin, which does the same or even better and more.