Driving in them isn't too bad, provided you know how to heel brake/toe accelerate with your right foot. After that, it's wee buns (as we say).
Water tubing is OK, but I find that it gives my beer too much head.
I wouldn't want to cool my cans of draught Guinness down in snow - I'd be scared that in those temperatures the widget might explode out of the can and cause untold damage.
But I'm interested in your idea of fitting bindings to the floor.
What DIN setting should they be at, and is it related to weight, heght, abilty to hold drink, or size of your ski pole?
Acutally, if it was based on drinking ability, then good drinkers would have loose bindings, and Aussies would have theirs wound up to 15.