>>Penalty
Alternative simulated slippage in counter currency units (default = 0), used in [Test] mode for entering and exiting trades and for entry and exit limits. Overrides Slippage and the limit fill algorithm (see Fill) when nonzero. Has no effect in [Train] mode. Orders are filled at the current price with Penalty either added or subtracted dependent on trade direction. <<

It is not the same as you proposed, but can be used for the same purpose.