The official marlin-based firmware also "only" goes up to something like 200mm/s and 3000mm/s^2 for my model, but I've flashed klipper on it which has given me more control so I wasn't constrained by the limitations set by the manufacturer in the firmware.
I was able to push it to 500mm/s print speed and 11000mm/s^2 accelerations, but small details started to suffer and I was getting too much ringing. For simple large prints I still use it though if I need a quick-ish prototype.