Hmm, I don't know if it's been asked about, or not. But, I don't know much 😃
Have you been over to the "feedback" forum to ask?
I think that one thing that would be difficult about this is that there will come a time when PHP is pretty much just PHP5, and then it won't make much sense to have a seperate category. If they'd made a PHP4 category back in '99 or so, would they have had to do some major moving of db info to reflect the fact that PHP is now pretty much all about version 4?
I do think it's a good basic idea, though.
Perhaps we should have a sub forum called "bleeding (or cutting) edge" or "new releases" or somesuch...I gotta figure with PHP's growth and the enthusiasm of the developers, there will come a PHP 6 some day ....