At the moment there is no way to unbind Seek Shelter (default G) from worker elephant,- it is shared with both villagers and worker elephants.
9/10 times you need this when villagers are mining near a tower/fort and there is a knight(s) charging in. You need to be quick, so you select box everything, press G and a worker elephant takes a villagers place, which most often results in loosing a villager.
Most players would agree that they would rather have a villager garrisoned in the tower than the worker elephant.
Please, add a feature so one could unbind Seek Shelter for worker elephants only, while leaving as it is for villagers.