Based on this one I coded my advanced speed controller.
It has toggle on/off.
If you bind pitch up to space (preferable for tight turns) it will automatically keep constant speed while you turn. This way it can be disabled but as soon as you press space it activates for as long as you are taking turn.
Voice information (On/Off sounds).
It keeps speed perfectly between 307 and 313.
No lag.
But I'll keep it private for some time.
Now I'm making sharp turns without even thinking about my speed.
I want to thank creator of this hack because he helped me in sending input to game.