Re: Is there any other type?
"It is the unprepared type that not surprisingly causes the worst injuries."
All of the aircraft that I have worked on have had manually initiated ejection systems. The only aircraft in which the seat occupant might not have initiated the ejection himself was in the Sea Vixen. There the pilot may initiate the observers ejection as the observer had to leave first due to a great risk of collision if the pilot went first, or they ejected together.
If you are aware of an aircraft which might summarily eject its occupant(s) please give a link. I would be really interested in reading up on it.