Could you explain a bit more? Do you mean that the decision of what to buy and when to buy/sell is informed by the tax consequences? Interested to learn more.

The most obvious one is holding for at least a year to avoid being qualified as short-term capital gains. There are other relevant rules too, for example look up "wash sale rule".

You’re right. Currently high frequency trades are penalised by commissions which has a fixed component. I’m still banging my head trying to figure out a simulated tax environment, but I’ll get it done.

The goal is to make it as perfect as it can as an imperfect proxy to investor skill.

Long term =15% ish percent short = 30% easy and close enough to make it fairly representative