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@jersey
radial lacing has absolutely no effect on strength for the front wheel. It's only an issue for the back wheel because there are rotational forces (torque) which are directed though the hub, to the rim. that's why you need some tangentially placed spokes, and you will only ever see a "half" radial (if anything) on the back.
that is also why you will never see a radially laced front wheel with disc brakes.... the braking torque is translated through the hub to the wheel and requires the spokes to be tangentially arranged.
if you don't arrange them tangentially in settings i described, you subject the hub flange, spokes, and rim holes to enormous forces as the hub tries to rotate within the rim.
The front wheel on a fixed gear, or on any bike with rim brakes, will never ever experience any torque through the hub. In these settings, there simply isn't any torque, or if there are brakes, it's directly through the rim and the hub is not part of the equation.
(for the picky, i know that the rim brakes aren't actually a 'torque')