Mounted Combat. Along with a new character class with expertise based around mechanical mounts(speeders, etc) and biological mounts (armored banthas, etc). Could call new class: Dragoon. (In napoleon warfare, Dragoons were mounted cavalry that dismounted to engage the enemy, and remounted to escape counterattack)
Also add usable weapons to mounts. Like the recon speeders blaster cannons from RoJ
Split off Beast Master expertise to its own Class. Pets can still be used by any class, but to get the most out of them and if you're going deep into BM'try it should be it's own class. Likewise Droid Control. Should be reworked so that while everyone can use a Droid, only Droid controllers get the best out of them. Possibly consider adding the trader prof DE and Bioengineering to there respective controller class.
New ground planet: the junk hell-hole of Ord Mantell. We already have a space zone, so let's add a ground zone as well.