Thanks BB, that sounds quite doable actually. :)
Will give it a try after work and see if it makes a difference in speed.

Is there a detailed spec for the .lx? files anywhere? Or are you guys just reverse engineering what other lux exporters do?
The information on the Luxrender wiki is all very high level.

Software: OS X 10.8 - Poser Pro 2012 SR2 - Luxrender 1.0RC3 - Pose2Lux
Hardware: iMac - 3.06 GHz Core2Duo - 12 GB RAM - ATI Radeon HD 4670 - 256 MB