I’ve found something that may be useful:
@Replies on lists
Replies work the same way for lists as they do for accounts. This means that if User A and User B are on a list and they mention each other, those replies will appear in the list. However, if only User A is on a list and User A replies to User B, that reply will not appear on the list.
If that is the case, why can’t i activate replies=all in lists/statuses as i can do in User streams?