Currently for each FireGL ASIC that is supported by MultiView, there is an entry within /etc/ati/amdpcsdb that tells the fglrx driver it supports MultiView. This is done through a key of [AMDPCSROOT/SYSTEM/2ID-1002-XXXX-0/DDX] where XXXX is the PCI ID of the graphics card. There is then the MultiviewEnabled option contained within that has its value set to 1. By replicating this, one can easily support MultiView on non-FireGL graphics cards. Just copy one of these sections from the amdpcsdb and replicate it but change the PCI ID value to your graphics card (you can find out your PCI ID using lspci -n).