My reply from yesterday wasn’t posted for some reason (it had images) so I’ll try this time in just text…
I found this option in build 4.2.1 however I just got 4.3 yesterday and you’re right, I do not see this option available in 4.3
Even in 4.2.1 the option is limited to BSPs only, no such option on static meshes. It would be great to have some official word on whether pivots can be saved at all in 4.3 onwards!