This one speaks for itself - when buying or transferring lions, they should be auto-unsecured. I can’t even express how frustrating it is to manually go unsecure dozens of lions every day! Buying fodder lions is definitely more painful when the seller secured them for whatever reason, listed them as “fodder”, and then leaves me to unsecure them.

ALTERNATIVELY: just like you can mass kill, chase, etc, perhaps a mass secure/unsecure tool in dens??