Something I would absolutely *love* although I understand it would take a ton of work and so definitely understand that it's unlikely:
An alternative path when dealing with the Emperor.
It rankles a bit that you have no choice but to side with him, even after he's lied to you the entire time. It would be nice if you could choose to side with Orpheus instead and once the Emperor was out of his head, he could extend protection to you of his own will. The Emperor states that it felt free as soon as he was inside the astral prism, so it would be nice if it offered some blanket immunity that allowed you to attempt to convince the honor guard/Orpheus to extend his protection in exchange for freeing him.
I think it could work something like this:
Defeat the Emperor, get a cutscene with the honor guard. You have to have spoken to Kith'Rak Voss or read *every single Githyanki Slate* involving the prince in order to have a dialogue option open up to convince them to let you live.
From there, if you've spoken to Voss on the mountain path, you can try and convince them that Voss has a plan for releasing the prince and may need assistance, you're happy to help for continued protection.
If you haven't spoken to Voss but you've read all the slates up to that point, there could be a reference to the hammer made in at least one of them, then you could make (a potentially extremely difficult) role to convince them you know how to free the Prince but you have to get to Baldur's Gate.
It would definitely have a little domino effect in Act 3. With the Biggest change being Ansur, it would be nice if you could bring him peace rather than a fight. Maybe in return, he could drop useful information (maybe his side of the story that the Emperor tells).
This is a wishlist of story divergence, I understand why they didn't do it this way, but it's difficult when playing characters I would describe as "stubbornly truthful" to force them to swallow this lie, and then continue following his instructions. If it was more like Omelium, it would probably wouldn't rankle so much, but the discovery of being lied to has only poisoned my opinion of that character and I don't think I'll ever run a playthrough where I have Lae'zel and I don't turn against the Emperor as soon as the narrative will allow.