CERT_* server variables are missing in mod_isapi.
Created attachment 19773 [details] mod_isapi trunk patch Proposed patch for trunk. Would like to see this backported eventually
Is the set covered by your patch complete? (Or perhaps a subset of what you found might be useful?) I'll consider this for the next release if it doesn't prove to require some extra conf-magic to keep things efficient (and avoid these if they aren't desired).