Crossing my fingers that this hasn't been suggested

I had a scary encounter a few weeks back. I was in the trading center, setting up trades for my cubs as I do, but somehow, in one of them I had also added my Stat Cow Trainee-- the 2000+ stat male I was training to stat-replace my heir.

The person who bought out the trade was nice enough to return him to me, claiming she thought something was fishy about it and really did want the actual cub that I had put up for trade. So it all worked out dandy, but I was incredibly lucky that she was so cool about it. I fear there may be some people who would have argued that they bought him.

So, I was wondering about there being a way to implement an option to "lock" certain lions out of trade & transfer? Perhaps it would also prevent you from accidentally killing/chasing/escorting them as well until they were "unlocked"?
Either way, it would prevent another situation like that from happening again, and ease the workload of finding intended-trade cubs in the Trading Center's "create a trade" list of lions. I'm sure it can be a bit of a pain for those with huge prides.

((Extra Suggestion by User: the same idea, but for items?))