Would be nice to have built in support for flaccl:

http://www.cuetools.net/wiki/FLACCL

FLACCL (former FlaCuda)
FlaCuda is probably a world's first CUDA-enabled FLAC encoder. It's opensource and licensed under LGPL. Newer versions of FlaCuda use OpenCL instead of CUDA, adding support for AMD GPUs. Current version is FLACCL 0.3, published November 25th 2010.
Speed Comparison
Compared to reference flac 1.2.1 on Core i7 940, it runs approximately 10 times faster on GeForce GTX 285, when using higher compression ratios (modes -7, -8). FlaCuda -8 is faster than flac -0, and provides better compression than flac -8.