Word on the street is that you can use a boot heater, but they're gonna mold to your foot after a few rides anyways so I wouldn't worry about it much. Then again, I'm really lazy and I also wear skate shoes, not bindings, so what do I know, right?
But I definitely wouldn't suggest removing the linings from inside of them! They just aren't made of that sort of business...like...you'd rip a bunch of stitching and you'd get totally bad mojo. I WOULD suggest, however, that you press the caps lock button again on your keyboard. Lets use our inside voices on wakeworld...unless you're in the boats and accessories forum and someone just told you that your boat is inferior to theirs. Then it's on!