slamfire
"Slamfiring" a pump gun without a disconnector, the Ithica M37, the Win 97 & M12,maybe others, is not a practice recommended or taught by any agency, academy, or shooting school at present. Fast, controlled aimed (well, pointed ) fire is the way. Slamfiring is cool as range trick or stunt to some folks.
I do know that at one time, slamfiring a pump gun in the defensive role was taught to some degree. I recall seeing a training film in the late 1970's, the film likely made in the 50's, where an officer slam fired a pump gun while rolling to cover. The whole class got a laugh out of that. Some agencies rewrote policy that required a disconnector in pump shotguns, as the devices became available in contemporary designs, or as the older shotguns aged out. My outfit had a number of GI type M12's, that phased out with a policy rewrite favoring the 870, and unfortunately, the Win 1200, which was universally detested. I believe one of the reasons the Rem 870 took off as a police gun was the disconnector 9aonother being cost). Not only does the disconnector mechanically regulate the rate of fire, requiring a release of the trigger, and hopefully, acquiring a sight picture, but it is a safety feature.