In K2 you can keep your alignment gray/neutral, but so far as content you are still forced to choose one way or another at the end of each planet. Or else the game does not go an further.
Korriban and Peragus are the only places where it makes no difference.
Telos you must choose either to let the ithorians restore its surface or to let czerka raid it and let the planet continue to be wasteland.
Nar Shaddah you must choose to either liberate the refugees and destablize the economy in the area dependent on slavery and mercenary activity iirc. OR you can allow either Visquis to continue imposing and ruling over the sector with an iron fist, or topple visquis and allow the Serocco gang in the area to rule.
Dantooine either allow the mercenaries to take over or fight them off to their bitter deaths.
Dxun/Iziz either you help queen Talia win the war or you tip it in favor of general Vaklu to take over.
The matter of the Jedi masters, either you reunite them or you kill them off.
The matter of your teammates is dependent on your alignment if not your actions. I've gone through it and gotten nill influence and it only slightly changed the outcomes in Kreia's final prediction.
The end game sequence and the ending is determined by your actions. The fate of the jedi determines the end cutscenes, while your actions on the planets determine the rest of Kreia's final predictions.