I added placeable wandering children, civilians and animals to GM Toolkit I under the humanoids and animals entries.
But I totally nicked this idea from Too Cool For Tabletop aka CuznJay
(
https://www.youtube.com/watch?v=ZMp9Pg-Ejy4&t=3s )
It's dead easy to implement. Just copy one of the root templates and add the Gen_Wander script to them.
If you are asking which mod added them from the ones you have installed... I would guess maybe one of his or GM Addon 1? I'm not really to up on the custom map mods so no idea who else might have thrown that in... searching Steam Workshop for "wander" only hit this mod (so maybe this is the one?):
http://steamcommunity.com/sharedfiles/filedetails/?id=1138604669
