I find myself sort of unconciously trail braking much of the time. I really don't think that it adds anything at my skill/speed to do so and probably adds to the likelyhood of tucking my front end one of these days. I have a tendency to chop the throttle closed on entry which has pretty much the same effect as trail braking into the turn.
I'm not entirely sure if the trail braking bit is a bad habit but I am sure that chopping on entry certainly is

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