Bballman has it right. If you do score errors on mental mistakes then you are not following the rules - which clearly address the scoring for mental mistakes not being an error. There is no such thing as a mental error. It is like a tie goes to the runner. Nothing in the rules on that either.
Ordinary effort is a definition of how to score the handling the ball. I.E. the expectation for a MLB player to field the ball and make a good throw is higher than a HS player.
But ignoring Rule 10 and making stuff up on how the game should be scored is half the fun of it. It always humors me when I hear people say stuff like - catcher should have blocked the ball in the dirt so it is a passed ball. Nope - Rules say it is a wild pitch.
Happily making up scoring decisions that are not in the rules or are opposite of what the book says doesn't change the outcomes of games and are fun to discuss.