Our first bread maker had a seed dispenser, but I rarely used it. A pal had an identical one, and he did, and he reckoned that the non-stick surface of the bucket had been abraded away in short order. That was many years ago and they may well be a lot better.
I have just made an 80% rye loaf (the other 20% was strong white) and it's really good. Pretty puddingy, but then that's what you want with rye bread. I also added some sugar and used three times as much yeast as I would have done for a white/wholemeal mix.