Pretty much I will sail with whatever mast rotation results from having uncleated the limiter. On my boat this is also very low friction, I'm not to sure about how low friction the limiter setup on the standard Taipan is.
Decided I'd jump back in to explain what I do in light of Wouters comment and add a subtlety about the Taipan rig:
When I round the top mark, I release the mast derotator (ie rotation limiter). After hoisting the kite, building apparent wind resetting the main tight and traveller where I want them, I then may or may not pull in the mast rotation as I mentioned earlier in order to get good flow over the mast. Like Paul (Taipan F16 #300), I know I'm going fast when I see just a hint of backwinding on the main, although I keep it to a minimum. I've never needed to pull the rotation in closer than 70 degrees, and I feel the superwing is plenty stout to take this load, having tested it heartily. But I firmly believe the superwing requires a lot less rotation on every point of sail to be effective compared to pear-shaped section masts.
Wouter mentioned that his rig rotation naturally going to 75-80 when the rotator is uncleated. I have a rotation maintainer (not a true positive rotator, like a nacra, because it can't get you past 90 degrees), but it is lame and I rarely use it (note that it is usely when sailing the Taipan without the spinnaker).
Anyway, I tinkered with the rig a bit to find out how I could control how much the mast will rotate naturally, ie with the derotator and rotation limiters uncleated. I've found that the key control for this on the Taipan is the side stay tension. So when I want to make the mast more free to rotate, I go with less side stay tension; if I want less natural rotation, I go with more tension. So in light air--when I really need the rig to rotate to 90--I set up the rig loose; in heavier air--when I don't want it rotation as much because the apparent wind is further forward--I set up the rig tight.
The result of this is the in heavier wind, I round the top mark and let off the rotator and the rig is limited to about 70-80 by the tight shrouds. Then it often ends up being just about right in terms of air flow without me needing to fiddle with any control lines.
So I like to do what Wouter says he does--sail downwind with the derotator uncleated. I just wanted to point out that on the Taipan you can set up the side stay tension to control the amount of "natural" rotation.
