The ALPA cameras had this kind of shutter release, and some other rather eccentric features; like the film winding lever.
http://www.alpareflex.com/Cameras/index.html

And several Practica models (and the Contax S-line) had some sort of compromise, wher the button were pressed down/towards you in 45degree angle.
http://www.praktica-collector.de/SLR_all.htm

-- MW