Jaap-
why not start making centerlock cogs?
We've discussed this before. The centerlock spline doesn't have any interference, because that would require a puller to get them off. As a result, they will turn back and forth on load reversal, which will trash soft aluminium hub shell pretty quickly. Brakes don't experience a lot of load reversal, fixed sprockets do. To get a splined interface to tolerate load reversal without fretting, it needs to be a flank centred interference fit with enough interference to prevent the pressure on the unloaded flank from dropping below zero. It would be possible to design a splined sprocket mounting system for bi-directional drive, but it would end up being expensive and an even bigger PITA to swap than 6-bolt, so a bit pointless.
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gbj_tester
It will do until somebody starts mass producing hubs with 6-bolt fixings both sides so that we can have a proper sprocket mount and a disc brake at the back too :)