A trading system that works for a $100,000 portfolio may not work well for a $10,000 portfolio. Suppose you usually want to backtest using an account size and commission rate that match your own account. Right now you have to change these account values each time you run a backtest. If the user could set different default values (instead of the current defaults of $100,000 account size and $9.95 per trade), it would save time and effort when running a series of backtests. Thanks!