Allow the character to be affected by the external physical world even when the acceleration is high

[idanarye]

If the character is pushed, Tnua will apply the maximum acceleration it can to reset its velocity. If we want the controls to be snappy, the acceleration is usually pretty high - which means that Tnua can easily negate these external forces.

I need to figure out a way to let the character be manipulated by such forces, without compromising on having a high acceleration for regular movement.