As an Options Trader, I was just thinking about "spillover volatility". Unfortunately, I can't find anything concrete about it.
I do intermarket directional plays haphazardly since i only do the standard 1% risk with no more than 2 non-equity directional trades at a time. Most of my risk is equity risk. Any meaningful size just clouds the read on my option portfolio greeks.
If could get a handle on a concrete spillover volatility idea, then I could definitely do some size outside stocks.
At best, I think non-equity futures options should be separated into a different account/risk manager profile.