After my first try, and following the comments I had, I posted another version of my patch for the zr364xx driver.This time, despite some little issues again, it seems to be on the good way!
Mauro is the maintainer for the Video For Linux branch, and he has got his own repository on kernel.org.
He has just posted my patch on the v4l-dvb development repository.
I hope I will post another message about this soon, with good news :)
Royale