IW 3.0 has an issue with mouse polling rates >125hz. (Just like id tech 3 and even later iterations.)
When I use 1000 hertz polling rate, the game will stutter and have an increased and uncontrollable mouse sensitivity at random times. (Similar issues happened with modern game engines, when 8k hz mice were released.)
Do you think we can fix this issue with the cod4x client?
I found this ticket from another id tech 3 derivative that might at least be related: Com_QueueEvent: overflow when moving high poll frequency mice during loading · Issue #191 · ioquake/ioq3 (github.com)