When i make sauerkraut, the only ingredients were salt and cabbage. I have seen a few recipes that through a green apple in there. Ive made it a few times. The room temperature has a lot to do with how long it takes. When I made it in the summer, and the house was warmer, it took 2 - 3 weeks. In the colder months, it took more like 4 + weeks. Need to do the old sniff and taste test because i know in the warmer months, if it is too warm, it can get kinda funky ( for lack of a better word). AS far as the vinegar goes, I make this once a month, shredd a cabbage, a little water, vinegar and garlic, and let it sit a few days which results in pickled cabbage. Definitely gets that pickled type flavor and not the sauerkraut. I remember i tasted the sauerkraut almost every day. And for the first week or two it has kind of a pickled cabbage like flavor, but all of a suddent, it jumps into that tangy sauerkraut taste.
Even with the vinegar, over time it will have a more pickled taste than in the beginning. Kind of like the difference between new pickles VS half sour VS sour.
If the room temp is too cool, the pickling/ fermentig process slows down and may even stop.
larry