If you start the game as a jedi, and then add the soldier class, do you lose the ability to use force powers and get new powers?
Yes, you do lose the ability.
in order not to progress should be non-spellcaster->spellcaster?
I have a corresponding question; on my last playthrough I was a scoundrel/consular, and I was using the Roleplay Padawan mod. Despite the fact that I had the scoundrel class, I was never awarded sneak attack feats and had to add them via KOTORSE. Is that normal?