VS05 is here.
This firmware is blessed with Instant Bitsetting which you can use with KProbe 2.2.2. This means that you can change the booktype of a +RW disc after it has been burned.
Edit: Unfortunately, the implementation of IBS in KProbe 2.2.2 is incomplete and thus this does not work. However, this has been fixed in version 2.2.3.