The thing is, combo is not a good way to measure the aspect of skill you mention either.
Squishykorean wrote:"Skill" isn't all about accuracy. Although most people agree it should be the largest factor, players have a variety of other skills which some focus more than others and that should deserve some acknowledgement in their score. In this case, it would be for players with the speed/finger dexterity to hit those few extra notes in the hardest part of a map to keep their full combo compared to accuracy players who will skim through that section and perfect everything else on the map.
For measuring the ability of being able to hit hard notes without missing, miss count is a better statistic than a score based on combo.
If you want to isolate speed/dexterity skill from overall accuracy skill, ideally, you should be able to calculate 2 different scores for each aspect of skill, and have two different leaderboards and rankings for the same plays.