I'd like to add frictionless movment to my character with key press.

Like the Tribes series, I’d like to add “skiing”. Basically, frictionless flight just above ground level to attain higher rates of travel. This affect would be useful for going down a hill, the affect would be compounded. Then, when a player releases the button, they would slow and come to a stop.

What about Rigidbody IsKinetic and Gravity false.? and then reactivate them when needed ?