These days I'm pretty sure it's up to the individual. There were a few people in our hall who became parents around about the same time as us and I remember having a discussion with one of the grandparents (who was an elder) a few months ago on this subject. I was saying I didn't feel that there was ever a need to use smacking when disciplining. I said I felt that it was wrong and there were plenty of other things you can do to correct your child. If you don't want your child to hit then you wouldn't tell them off by smacking them as it's a total contradicition and would be confusing to the child. He responded by saying all children need a good smack or they will turn out spoilt, it never does them any harm! This elder's son (who has just been made up as an elder himself) used to take his baby daughter out of the hall when she was crying but would put his hand over her mouth so she couldn't scream! I also saw him cuff his young son around the head a number of times :/
Another time I was talking to my friend who has a little one a couple weeks younger than mine about the fact that I had smacked my child whilst angry and felt really bad about it. She said her little one was always naughty and she was sure she didn't smack him often enough! True story.
Using the rod was sadly very much in evidence at our hall!