The common practice is to utilize the FFMD (forefoot measuring device) from @Bikefit by having the client kneel barefoot and placing the device on the heel and thus using the device to measure the degree for each foot. Often each foot is measured 3x and the blended number used to correspond to the amount of proposed wedges to be used. I think this is a 1.0/basic setup even though it is the gold standard. Forefoot angulation is part of the equation but is impacted by other factors that have to be addressed. Since the ankle has radial and axial loads I look at the rotation of each foot on the axis separate from the forefoot tilt thus creating a "percentage" of split from the inside to outside of the shoe/foot. An in-the-shoe wedge has 50% of the potency therefore it is important to know when to split internal vs. external support. The last and probably most important part of the equation is the type, height and length of the arch for each foot and how it will respond/react to being weighted in the power band.
In a perfect world everyone would be diagnosed via a @Footbalance podoscpope in conjunction with an FFMD and have custom footbeds made. It is also widely debated if cleat placement (especially rear arch cleat) can reduce or affect the amount of forefoot varus. Ultimately after all the adjustments have been made, lazers and other motion capture programs can be paramount in diagnosing and auditing your adjustments.
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