When molding liners, I've always read or heard that how you buckle the boots will affect how the liner molds. Less buckle tension will compress the liner less and tight buckle tension will really compress the liners. Pretty self explanatory until you're trying to achieve a specific fit.
Now the question... I've got a wide foot and trying to create a little more room for my foot. So should I tape spacers on my foot and crank the toe buckles down to compress the liner for more room or barely buckle the toes? I can see it both ways. Light toe buckle tension when molding would create a thicker softer liner requiring less buckle tension while skiing. Meanwhile, cranking down the toe box while molding will make the liner smaller to give me room but also make the liner stiffer and require more buckle tension when skiing to get a tight feel.