I have a theory that we could bolt down some spongy netting to a mountain or ramp with an appropriate coating or sheath that would approximate the sensation of under-the-skis (or board) snow without requiring cold weather. Apparently they do this already, but you can't turn on it. To me, that's a pretty serious design flaw. To ski-jumpers, it's hardly noticeable.
Mokalus of Borg
PS - I'm sure it comes in handy for them in their off-season training.
PPS - But even ski-jumpers have to turn at some point, don't they?