You can also treat this as a (small) feature request, rather than a proposition.
I've discussed CAVOK METAR interpretation with Thorsten last year, but we never finished the discussion about visibility. I believe that current CAVOK visibility is way too low compared to most real life CAVOK situations and other AW METAR interpretations. Minimum CAVOK visibility is 10km and current FG CAVOK visibility is 13 or 15 km i believe. Statistically speaking it's wrong since we are close to that minimum instead of a more average visibility. My motivation for asking this is that at my local airport CAVOK is most often reported, and frankly it's no fun to always fly in lots haze when in reality visibility is usually much better, but more importantly statistically inaccurate. Visibility is much better in all non CAVOK metar interpretations (except in reports where visibility is reported below 10km), so CAVOK stands out here compared to the rest. I don't see a reason why CAVOK report should have such a low visibility compared to other reports such SCT040 report for example. If this change is acceptable, I would be interested to hear from other people what would would be the best (most common) visibility for CAVOK, or maybe derive visibility form temperature and dew point or simply treat it as a 9999 SCT055 report.