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Hmm, I've never actually skidded in a fixed crit so maybe the powertap hub could work.
It's not just skidding though. I once gave a decent amount of resistance through the pedals of my track bike because I wanted to make sure I made the ramp at the velodrome, and the rear hub started to unwind itself. Not a nice feeling. So slowing down vigorously is enough, and I'm assuming in a fixed crit you may need to slam on the anchors occasionally.
Hmm, I've never actually skidded in a fixed crit so maybe the powertap hub could work.
I think Garmin vectors with ultegra pedal swap would be good too. I'll have to see if this means the pedals are deeper, more investigation needed!