hastati: how to throw the second pila?

on more than one occation: when i order hastati to perform their attack, they throw their first pila and then charge. i thought, they were supposed to throw the second pila at a close distance, but they don't. sob. sob. :(

put them on fire at will and have them stand in range until they unload.

i dont' know any way to do it with one order though

Historically, they would throw one pila then charge in. As said before, if you want them to throw the rest of their pila, hit fire at will.