Let me reiterate: Morton's foot is NOT a "deformity."
(Knot tears hair out and goes to weep alone in the corner)
The pattern of pains and calluses described on various websites are not unique to Morton's foot. Every foot that pronates too much or that has sloppy muscles and a dropped 2nd met head is gonna be just like that. Greek Foot or Egyptian Foot, they will look and feel the same. Pronation and dropped met heads are POSTURAL problems, not STRUCTURAL problems. They happen to us all.
Now, I'm gonna lecture about accommodation vs correction.
Accommodation is allowing a problem to continue, but finding a way to cover for it. It's like if your brother is an alcoholic and keeps getting into trouble for weaving his way home from the bar singing loudly and cussing at the neighbors. So you start stocking your house with lots of booze so he does his drinking at home. No more singing and cussing, no more problem... right?
Correction is fixing the ultimate cause of the problem. You send your brother to AA. No more singing and cussing, no more problem... right?
The result is the same. The question is which fits into your lifestyle better?
The pad under the first met head is an accommodation.
Stretching the tightened structures of the forefoot and strengthening the muscles of the foot (and really all the way up to the hip) is a correction.
Both have their good points and their bad points.
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson