Qmaster is really good for breaking up parts of your render across your processors while using Compressor, i.e. 8 cores compressing one single stream into Mpeg-2 one frame at a time is really inefficient while compressing 4 streams and re-assembling them later is much more efficient.
The good thing is that FCP is fairly efficient at using all your cores already. It pegs them all out fairly well and does a fairly good job, it doesnt have to do the massively intense calculations that Shake or Maya has to do so Cluster renders just havent been a priority.