~Classes~
Weapon Choice: How about adding it where you can choose the weapons that your characters master? In a nerdy way to ask, how about having a Jedi Knight master Juyo or Combat Technique. Or a smuggler using a blaster rifle or bounty hunter using a sniper rifle.
Imagine a Sith Warrior using a dual-bladed lightsaber or a Jedi Knight having a lightsaber in one hand and an offhand blaster pistol for some range. All great ideas that I'm sure has been thought of and been turned down, but worth asking.
Faction Changing: Because each faction's class has a parallel to the other faction
(Sith Warrior = Jedi Knight, Imperial Agent = Smuggler, Bounty Hunter = Trooper, Jedi Consular = Sith Inquisitor)
and every character you create has an alignment, why not use that to have the option to change factions? If you're a Jedi Knight
with Alignment Dark V, you should get the choice to change factions to Sith Warrior with the same character, same level, and same advanced class (Defense = Immortal)
If you're Light V as a Sith Inquisitor, you should be able to have the choice to change to a Jedi Consular. But, if you wan to continue down your path, you can truely become what you made your character to be.
If you make a Trooper and want to stay loyal to the Republic, you could achieve Major from Light V. This is just an idea that is completely encouraged to put more change into,
but I think Faction Changing would be an interesting idea for the RPG part of this game.
Different Class Stories: This is a lot of work, but how about adding another option to the RPG part of the game where you can choose your own story for your character's class. I'd love to replay a class with a different perspective.
While choosing your class, you can choose the planets you go to as well. Instead of going to Nar Shaddaa and Balmorra, why not choose one, but have to keep doing side story quests so you can keep up with the level requirement.
I know a lot of people dislike going to some worlds, but I think it would be a cool and new experience. Perhaps different companions (Also different romance-able) to your different stories?
Backstory (Confusing, sorry): Also, perhaps adding an option to go out of your way to make the Prelude a back story. Such as training, or learning from an Officer or Master AS a companion. Instead of having it as you're starting as an amazing
character who has special privlages, have it so we do that ourselves. Make the backstory all about obtaining achievments. Depending on the amount of achievements you recieve, this creates the character's reputation for the rest of the story.
I think it would be amazing to have a different story depending on each character you create because I personally give them all different personalities.
~Characters~
Gender changing: How about an option to change your gender as well? That one was pretty straight forward, so...
Customization: There are plenty of customizations which make SWTOR stand out from any MMORPG I've ever played. Just a really small side request because the customization is already so perfect,
how about adding more Body Types? I'd love to make a character the body type of 2 or 1 with the height of 3. I'd love this, but it's just a small request.
New Voices: As I replay stories, it's odd to have my characters have the same voice as another one of my characters with totally different given personalities. Another small optional request, but it's worth adding.