how can i get the navmesh agent to stop accelerating while turning?

i have been trying to get a game with a more DOTA like feel to it, but due to the default way the navmesh works it seems too fluid, the way turning works is very important to getting the game to feel right and i just can't seem to get it working. while a navmesh agent is changing it's rotation it should not continue accelerating (although it can slide) so if you try to go a direction that requires you to turn to face it than the agent should stop and turn before moving, and if they go around a corner that should slow slightly while turning (due to not accelerating through the corners) as of right now my project is just a simple navmesh setup with a cube and a plane.