Let's Explore Possible Crit Boots
Let me forward by saying, For this once i ask you to leave the debate over whether crit boots are needed or not at the door before participating in this discussion. Lets not let that get in the way of exploring cool possible modifiers for such boots if ever they were to exists. Let's instead discuss which suggestion we like dislike or improve upon.
With that being said, time to put those creative brain cells to work and come up with some cool passives.
So I'll start: boots give: 10% crit and converts a portion (say 10%-25%) of your crit damage to magic damage which you can't lifesteal off.. It would make it more tank oriented, such that its good on champions like irelia/volibear/xinzhao/aatrox/trynd/mastery Yi (all have built in heal) who might not require lifesteal so much.
win rate. Its handy if you want to get zephyr instead of mercs.