Okay, you’re correct I was confused about the timeframe. But I don’t think the fact that we merely use our fingers more is expressed through natural selection unless people who are better at using their fingers are more effective at reproducing offspring. And they very well may be, it just takes a stretch of the imagination, imho.

Basically the selective pressure is always about if it makes you more or less likely to successfully produce offspring, who then in turn produce offspring of their own. Characteristics that make it less likely to do this die off, or are at risk of doing so. Characteristics that don’t effect your ability to reproduce don’t really effect the selective pressure.