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@Rod_Munch
Personally I've only used it if I know I can't get the part to stay put otherwise at the recommended torque (as per my seatpost upthread ^)* or if there could be a catastrophic consequence of any slippage (e.g a smidge on my bar and stem clamp).
It's never occurred to me to use it on a steerer tube because I can't imagine the stem could ever come flying off upwards(!) and it's only likely to move sideways in a crash (which would probably be preferable to snapping off completely or whatever the alternative would be?).
Either way, there is no paste on either of the bikes in my house that have a carbon steerer - one fitted by me and the other by a mechanic...
*I've since discovered that hairspray is just as effective, without scratching anything up...