Default D800 Bluetooth Voice Dialing

Bluetooth voice dialing works on the D800 stock ROM. However, I would really like to use one of the Flex ROMs, or even one of the other G2 ROMS (which most use international as base), as my DD, but I can't get bluetooth voice dialing to work on any of them. Has anyone got it to work on a non-D800 ROM, or is it due to a change LG made in the framework, and it simply isn't possible? Thanks!