Create a model, texture it, tell devs to include it. It's not simple, but requesting MODELS is last thing people should ask for.
Yeah and make sure they pay attention to this bit
"Mongol sword was a slightly curved Scimitar which was used for slashing attacks but was also capable of cutting and
thrusting, due to its shape and construction, making it easier to use from horseback"
So we dont end up with another curved sword that either cant thrust or only does 2 more damage than a Wooden sword