I saw the Symbol Mapping and didn't know what it was, but after reading the article, I like what I saw.
This isn't a big deal, but a shadow trading feature with it would be great. For instance, if someone is trading a live account, he/she can use Symbol Mapping to link it to a demo account with a modification.
For instance, you might want to go for a 2:1 reward-to-risk ratio, but in your shadow account, you might want to have it set up so that it's 3:1. That way, you can see how it would've performed and you can make adjustments. Ninjatrader has a feature similar to this.
Thanks for engineering Protrader