A kisser button is supposed to touch the corner of your lips, which is why they call it a kisser button, unless you're an Eskimo. Assuming you have a consistent anchor otherwise, if you want to touch your nose to the string, I don’t think you need a kisser button to get a consistent anchor on the string. Normally, people who touch their nose to the string use an under the chin anchor, which is a little low for trad archery distances. At trad archery distances, nose to feather seems to work better. Remember that the lower your anchor, the farther away is your point on distance. In trad archery, we would like to have a point on distance of about 25 yards, which is difficult to get without some help, such as a fixed crawl. With an under the chin anchor, your point on distance will be 50 yards, + or -.