Hey John - A clamping diode or varistor across the contacts makes sense too.
FWIW I recall the VR's on a couple 60's era, Mack and Reo farm dumps where I wrenched sometimes as a teenager. The trucks had BIG 80 - 100 amp generators (this is pre-alternator days...). The VR's had both capacitors and what looked like diodes or resistors across both the voltage and current regulator contacts inside the VR box.
At the time I dismissed them as RFI surpression components to reduce static on the AM cab radio. Could it be these extra parts etc had and a more fundamental purpose??
It might also would explain the polarity sensitive nature of those VR's...
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