Ian's knot saved me some time in the past decade or so. Is there a knot with two settings for tying and releasing? Releasing it to a point that allows taking o

Ian's knot saved me some time in the past decade or so. Is there a knot with two settings for tying and releasing? Releasing it to a point that allows taking off the shoe and pulling somewhere else to fix it firmly again? It must be adjustable because laces get longer over time.