That was asked for ages ago. Biab has that option but it has to be implemented in the application bbw4_64.exe first so the Plugin can use it. The Plugin features get added quickly but the bbw4_64.exe has to wait until there is spare time away from working on Biab.
You can open the saved SGU from the Plugin in Biab drag the Master to DROP + and select separate tracks and bit rate, but you are back to square one and you will only get the first page of tracks..