If the newly added content is incompatible with BoS: SR then no, you should not add it (except if it's better than BoS: SR, which is highly doubtfull). If it fucks up with canon lore, then you shouldn't add it ("Persuade: Yeah, Bastila, why don't you come with us in the Sith Academy, I'm pretty sure the sith masters there don't know your face."). There are no such things, right? Except for the Bastila part, I could live with that ("Random sith master: Look at this fallen Jedi, he's bringing Bastila with him! Better not to intervene with his doings.").