What type of ATS are you running? Day Trading? Swing trading? What type of strategies? I understand if you don't want to share too much.
I've been working on a swing trading ATS myself but so far it is not profitable so I'm snooping around for some inspiration on how to improve its performance.
What is so terrible about a simulated stop loss as long as it doesn't explode in your face more than once a year?
And regarding filtered feeds. What others can you name besides Interactive Broker's Cluster F*ck?