Right now, transactions are driven by sell rules: once you sell a stock, you automatically buy the highest-ranked stock in its place. I’d like to see the opposite as an option: buy rules (for example, RankPos <= 10) have primacy, forcing a buy, and then the lowest-ranked stock held is automatically sold.

This should be relatively simple to implement, and would provide a lot of interesting simulation options. To me, it makes more sense to give buy rules primacy over sell rules, and I think results will improve.