I don't even know what that means TBH, but Ruxxter scripted up speed detection for UN that did pretty well
it showed false positives during times of server lag, but detecting anyone who is speeding like that idiot in the video would be easy

you send a trigger to the server from the client every second, and if the server sees that it is receiving 1.05 triggers per second on average, rather than 1 trigger, then you know the client is speedhacking by 5%

but yeah, iClassic's server lags so badly that this would be incredibly unreliable in every instance other than full-****** speeding like the guy in the video

not really hard to think up that concept though, so my best guess as to what you mean by it being built-in to the server is that it was implemented in a way where it checks your x/y position on the server rather than involving the client in any way - if that's what it is then that sucks

ya, I was walking to the old GS arena in Swamp with Crono and randomly got banned, was running on a desktop with an overclocked CPU and GPU at the time