i got another suggestion for later on down the rode, when you've created the game and got shit working properly.
-a 'Pop meter' to control how much air you're gonna get off tables and such. it would make the game much more fun. and instead of getting points in the game, just completely a trick with super air would be sweet. like in real life skiing. also if your pop was too much on rails, you would either disaster or eat mad shit.
-the ability to switch from 'session' format (ie: unlimited hits on terrain, no points) to competition format (ie: points, rated against other game players)
-switch skiing = controls backwards
-rails should have a slip factor (ie: leaning too far back), and not just balance factor.
i guess what could make the air assualt really sick would be is the keys were presure sensitive. just like it calculated how long you held it and that would let you know what is gonna happen. perhaps you could create something like an
'axis gauge' or something:    so when you hold the buttons of a certain axis, a little line goes up letting you know when you're full power. that would help control throwing 3's and all that as well. then again, it seems like that would have a lot of coding behind that. so do whatever you need man.
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I ride for that moment when I am hauling through trees, weaving in and out, in chest deep powder, and I can't even open my mouth, or the snow will shoot in the back of my throut, either choking me or quenching my thirst. That's why I ski.