This feature gives big advantage in options trading:

https://app.alta5.com/help/intro.html#smart

Smart Pricing

In the example above, you may have noticed no price was specified. Alta5's Smart Pricing feature automatically calculates the optimal price(s) when opening opportunities. This is particularly useful when opening an option or spread opportunity as Smart Pricing will automatically attempt to fill at prices between the bid/ask spread.

For example, suppose you wanted to open a call option opportunity and the bid price is $1.20 and the ask price is $1.45. Smart pricing will automatically try multiple timed limit orders between the bid/ask prices (e.g. $1.25$1.30$1.35, etc) until the order fills.