This is nice and I want it to work like that on my cross hotbar 1 and thought that was what "Automatically replace cross hotbar 1 with pet hotbar when mounted." was supposed to do.

If I enable use pet hotbar under cross bar settings then I can only cycle to it on my cross hotbars. It goes from Set 1 to Set + and back.

Under character config -->Cross---> Use mount hotbar and unchecking it allows for free cycling again (same with Use pet hotbar). Either one of those checked means that I can't use any other cross hotbars unless I hold my cycle button and manually select the cross hotbar. I have tried so many combinations of unchecking and checking settings, that I had to give up for now and came here looking to see if it was a bug.

Not sure if any of that makes sense (shouldn't try writing this early in the morning...), but I would like pass along my experiences with the new settings.