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Re: pterosaur femora sprawl [forelimb sprawl only]

[...] the fore limbs are portrayed as sprawling (very sprawling, often with the elbow anterior to the glenoid--

This is not what the tracks of fast-walking pterosaurs show. Tracks of pterosaurs trampling around in one spot do show some sprawling, though.

On the other hand, if continuously quadrupedal, then there had to have been a series of taxa with an increasingly laterally-oriented manus (what would have caused this??).

Flying being a stronger selection pressure than walking. Anyway, walking still works, see tracks mentioned above.