Change in satiation level should not interrupt walking
Going from Satiated to normal (presumably other similar changes as well) interrupts walk mode. It probably should not, unless you become hungry. There are very many walking interruptions already.
I don't see any reason why someone would want to interrupt walking merely because satiation goes down. Bloated -> satiated might qualify, if you are carrying that blink dog corpse and are running out of holy water. I have never found that to be an issue, though, at those times you just don't use the extended walk command. :)