My list.
1) I'd like to see chapter 4 for all my classes. And after sometime chapter 5. I like the most class storyline.
2) I'd like to play neutral characters. Smuggler is Republic, and Bounty Hunter is Imperial. There is nothing realy in the middle. In SW there is a lot of great characters, that are in the shadows, like Lando or Watto (Gambler), Jabba or Xizor (crime boss), Joruus (Dark Jedi) . I understand that is very difficult to make another fraction, but what if neutrals could play one planet as Imperials and other as Republic? Just suggestions.
3) I'd like to see more planets to explore from movies - not exactly Endor or Dagobah (it should be not known too much), but Kamino, Naboo, Utapau, Geonosis, Felucia or maby even Bespin. And some planets known from other games like Ord Ibana, Malastare or Maanam.
4) some more races to play, but less humanlike. Wookiees, trandoshans, or Hutt maybe .
5) Legacy name change option .
6) Give more actions to pets. They can steal, or bite enemies .