Two almost proprietary indicators/ratios developed by tastytrade/tastyworks are their option Liquidity indicator and IVR (implied volatility ratio)-both cornerstones to research driven options trading. Interactive Brokers added IVR and related ratios over the last year, but still does not provide an option liquidity measure. Probably not complicated for you guys to provide (easy for me to say?), but would cater to another entire class of investors, possibly.
Thank you for the feedback on those two indicators. We will add them to the list of metrics that we are considering for the future.