Post: #2

unfortunately there's no easy solution
FPS Patch is not a change-speed, but it act in the same way: it accelerate the client behavior. And this will make it walk faster than default clients

there's no source-code for FPS Patch, because it's a injection exploit "feature". UO is a old game where many actions are based on actions instead precision timing. So lets suppose that the walk animation have 10 frames with an 20ms between each frame, this animation will took 200ms to run, and when the client play the full animation, it will try to walk again. Now apply the FPS Patch effect: it accelerate the game FPS, making the delay between frames drop from 20ms to 17ms (example). Now the animation time will be 170ms, making it run faster

so the only way to block FPS Patch is applying the same rules of blocking change-speed. Also the only way to prevent players to be reported is telling him to not use FPS Patch anymore

EDIT: you can try using EF_FastwalkPrevention on sphere.ini to enable sphere internal change-speed detection, but this feature still experimental