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@benbrangwyn
I read that threaded steerers are significantly weaker than non-threaded and that it was dodgy to clamp directly onto the threaded area. Terms like "stress risers" and the idea that stresses will be concentrated on the thinnest part of the tube (ie where the thread has been cut into the tube) make me very wary of doing this.
Makes sense to me.
I guess you could ask yourself this: "if the steerer tube were machined down so that the threads weren't visible, would I be happy to clamp on the stem?" - 'cos that's the true thickness of a threaded steerer in terms of dealing with the stresses that a clamped stem will exert on it.