Re: To sutemi, or not to sutemi
I can think of at least one sutemi technique in Aikido. There is a photo of O-sensei doing this in one of the John Stevens books (I don't remember which one).
Tori is in seiza. Uke comes from behind, grabs both of tori's shoulders and pulls back. Tori rolls backwards (supple toes and ankles are a prerequisite), and with his hands draws uke's elbows down slighly. He then extends both legs and hooks his big toes around the back of uke's jaw. Straightening the legs will then break uke's balance forwards, and then rolling back to a sitting position will project uke with considerable speed.
I still remember the astonishment I felt when Kanetsuka Sensei first did this to me...