I had one on my FAC, but not for long. As you might expect, it had an Australiannumber but was totally UK
after having been through the complete workshop FTR system, under my supervision. I can't really remember what was done to it to reinforce its semi auto status. It was just one of those things. I suppose you could have done something to it so that you'd get a bit of rock and roll and shake it to bits in short order but I never knew anyone that did. In those days, the law close to punish those who actually broke the law as opposed to just chastise or 'pre-punish' everyone as they seem to do now.
A bit like car ownership really. Plenty of people have cars that will exceed the speed limit but that ain't banned cars capable of going fast yet.
Just my jaundiced view of course