In Age Of Kings Beta, initial Trebuchet and Town Center for raider civilization. was supposed to work like this. When ordered to unpack instead of unpacking right away. It is almost similar to Villager building when you order villager where to make your building. I hope that this feature makes a comeback as a new ability feature instead of replacing Trebuchet mechanics. Here is the video link:
I think this feature might just get added in future for ingame Battle Royale(saw some Battle Royale codes from RMS scripts) feature. If that’s the case then it’s really good and will offer many new modding opportunity for modders.