VP - No it does not mean you carving the ending, it means the player carving their fate throughout the game "You reap what you sow" And you yourself said that people don't like replaying the malachor surface, that fixes the replaying part.
Bead v - Have T3 speak the lines and on another note what does T3 do in this mod? What exactly would we have to lose if Mira was... disposed of
As I have not triggered the influence cutscenes on malachor, I do not know if this already happens, however I do not think that the influence cut scenes should happen if the player is dark sided because that would make the attacking party member light sided, which would not make sense.
And yes, having things be automated is much more cinematic, as their is no point in being a party member unless: They have to free you (T3 peragus), they have their own mission which the PC cannot do and cannot be done with cutscenes (HK Factory), they have a choice to make (Handmaiden/Sisters) or They are going to live or die (Atton/Sion). My big problem with having the HK/G0T0 scene player controlled is that your screenshot shows five of the best assassin droids in the galaxy... against a math droid