In reply to JendeHoxar:
You're being a bit over sensitive but by all means reverse log the same climbs and whinge about their poor style if it really gets to you!
By way of explanation: log books are used by many people for different purposes, so, for instance, I simply like to record what I've done but some people use them for more serious purposes such as evidence collecting for various training schemes and (at the more "senior" levels) these can demand a record of witnesses, belayers or partners. I'd guess this facility is there for that purpose (and I guess that purpose is to discourage people from making the stuff up in their log books when they submit evidence for these schemes).
I wasn't aware of this facility myself but now I've found it I will be using it to annoy my climbing partners.