Aw. This is a real shame. Back when I played I liked dressing up in a little magician outfit and flying around / teleporting (the netcode takes the absolute position of the player from the client).

At the time the client was Unity + Mono (haven't checked if it still is) so you could just add a DLL with your own code that gets loaded, as well as ahead-of-time patching Assembly-CSharp to introduce your own hooks. Super simple & really mod friendly.