I remember reading about a "pencil technique" by which you slip your foot in and lay a pencil (screwdriver, dowel, chopstick, whatever) across the location you want the crease. I've never tried it, but seems like it should work to "train" the leather.
^ I tried it on a number of shell shoes. At best, it did little to form the crease. All the pairs I tried this on eventually developed the regular chaotic creases. Maybe if you walked around with a pen pushed on your shoe for a week you might get something out of it.
excuse the dirty floor. ravello lwb about 1 month. i'll try to take a photo of the cigar pair which is about 6 months now. don't know whats the blue little specs in the photo but thats how it came out.