I'll repost a suggestion I gave in a thread way back.
Allow a dialogue (persuade or intimidate) check for ending a fight, representing a "whoops my bad, let's chill" or "surrender or else I'll murder you all" option.
-The DC could go down by 1 or 2 for every enemy you killed/knocked out, and by ~5 if you incapacitate their "leader."
-You only get a limited amount of tries (2?) before the enemy won't speak to you anymore. This prevents just spamming it every turn to eventually get a high roll.
-It costs an action to try. Again, prevents spamming.
-Maybe only allow this for certain fights (e.g., Githyanki patrol would probably fight to the death. Enemies have to have some level of intelligence. etc)
Assuming Larian eventually fixes knock-out so knocked out enemies stop being hostile, this would fit very well.