Variable Bit Rate Query

Searched but found nothing on this query:

Can DVDFab Platinum 5 encode video using variable bit rate? I thought the two pass encoding option might be do this but the fixed bit rate or file size option remain selected. Furthermore, there doesn’t seem to be any settings to configure the bit rate range I’d like to use for any VBR option.

Thanks

I’ve wondered that myself. Hopefully someone chimes in.