You know the character Frozone (Or Iceman from X-Men) . I always wanted to surf in air like he does. I have two ideas for this. For the first one, the mod might make you freeze the air and on it you could go faster(This is easier to do.). For the second one, you activate the surf mode. Character starts to freeze the ground and surfs on it. Whenever you go, you freeze air automatically to surf on it.
Like on this game:
In either ways, it would be very cool to have a skill like that.
Photo of Frozone Surfing in air: