A simple idea, as explained in the title. This is frankly just a quality of life improvement and doesn't actually make the player's job easier. For example, if I wanted to kill a non-hostile NPC who I could aggro through conversation ("I've come for your ugly head! *attack*"), then I could obviously do so through the conversation, but then I'd risk losing initiative. However, I could just as well initiate combat manually and attack without having a chat to begin with - I can think of only a single instance where I genuinely lose access to information by skipping the conversation, and even then it doesn't really matter. By manually initiating combat before even talking, I get top initiative anyways. So, might as well just ensure the player moves first when a fight starts because of a conversation option, so the immersion wouldn't have to be broken with this gamey little tactic.