Could there be a preference to change this?
No, I don't think that there could be. This is a fundamental change to the way Audition works, and it's been requested by a lot of people. It's much safer the way it is now, because if you
do want to keep something, you don't lose the lot if power fails during a save of the temporary files.
i dont get it why fix it if it aint broken.
I think that the majority of people would say it
was 'broken', in this context.
Since you still presumably have the previous version, you can always go on using this, of course...