Massimo, good news. Web2py is successfully being adopted by more and more developers who are using it for very serious purposes. It's going viral. Therefore, there need to be at most a few major releases a year and a bunch of incrementals in-between.
I anticipated a challenging release with the latest DAL changes. At enterprises where I've worked in the past, changes to the db layer were always considered major releases. That's when the troops were mustered to test en-mass before pushing the product out the door. Web2py quality must always be of paramount importance. In the absence of a delegate, we look to you to lead this issue. It almost goes without saying that doing it right will ultimately have a larger impact on web2py's credibility than upgrading the documentation did. But, doing it wrong will have immediate disastrous consequences.