I'm not sure what minimum time would be useful for. Maximum time is used to only vote if the creation is less than n. This is useful for ignoring late votes that will yield very little benefit in curation.
Minimum time implies that you would like to ignore the early votes in favor of late ones. I guess it makes sense for flexibility, but I'm not sure if it's typical use.
The other ideas you mention would require an analytic component. Right now, drdoogie only uses the API to look at the blockchain and that is very limited in terms of evaluating analytics.
No issue. I was just curious about yr future plans. This is already gr8 stuf.