Please add ability to filter on squawk code.
What would be the purpose of this? The code changes.
A few thoughts come to mind on why this would be useful. For instance you could filter out, or filter on only VFR traffic (1200), or you could filter for just glider traffic (1202), or just Fire bombers (1255), Search and Rescue (1277), Miltary Training Route (4000), Aircraft in distress (7x00), and Aircraft on Intercepts (7777).