There are actually a couple of ways to address your concerns. The first is regarding the smells.
If your cat isn't covering her poos, and they're really smelly -- there's realistically no litterbox solution that can completely fix this problem. All of the auto boxes (SF as well as all the others) pretty much have some sort of timing solution to protect your cat -- so the poo is going to sit there uncovered for a period of time and smell.
So (in my opinion) the first step is to address the source of the smell -- and more often than not it is as simple as changing to a different food. There are numerous posts here at LBC in this section that address this pretty well. I'd recommend that as my first area of research.
Now to address the second question -- the way the SF works is to dessicate (completely dry out) the poops using the crystals. The standard SF times 20 minutes after your cat has used the box before raking, so unless the poos are very runny then they will most likely not stick to the rake and you should be fine.
As a side note, our own Stan has never covered -- so even with the right foods we still sometimes get a 20 minute period when we know he's done his business.
If only we could teach him to burn a match or do a quick squirt of air freshener when he leaves the bathroom we'd be much happier.......
