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unlike in say a high revving motorbike engine
A R1 crankshaft is about the same weight as a whole entry-level road bike and turns 100 times as fast as your bicycle cranks, and it has plenty of rocking couple thanks to the cross-plane design. I don't think your bike need a balance shaft geared off your bottom bracket, but do feel free to build and test one just in case it's a marginal gain everybody else has missed :-)
gbj_tester
Thats enlightened me loads.
From years of mountain bikes with big tyres and suspension you get used to pedalling induced bob from tyres and suspension bob, and linkage flex and bushing slop/bearing play.
As mdcc_tester has pointed out to me the moment is small and unlike in say a high revving motorbike engine an imbalance is unlikely to result in a massive parts failure.
From never really paying much attention to track or time trial bike set up's ( as i have never done either) i assume if the wobble was an issue it would have been looked into at a pro level and if it was of issue or a possible performance gain then the pro's would have started balancing things to reduce it, which would soon get noticed and everyone would be doing it.
:) loving the technical side of the forum