Will Summit cast smaller roles?

I've been reading Eclipse again for the millionth time because my friends STILL has my copy of New Moon, and it just finished filming. I was thinking about if they were going to cast some of the other smaller roles, like Levi Uley and Rachelle Black. I'm not sure if they will, as Lauren, Austen, Ben, and lots of the humans were cut out. However, Rachelle does play a role. Paul imprints on her. So, if she isn't in the film, then it won't be as dramatic. This is because everyone around Jacob is supposed to be imprinting, except him. Sam, Quil, Paul, and Jared. So, if they are leaving out some characters like Rachelle, and Jared's imprint (it doesn't say her name in the books), then it's going to make it less dramatic when Jacob is depressed because everyone is imprinting around him won't be as emphatic. Of course, they have to add Claire in, because it would be wrong to leave that out. Quil and Claire sets up the idea that the imprint doesn't have to be romantic, and it can happen at a young age. If that is excluded, then it's going to have be explained in Breaking Dawn when Jacob imprint's on Renesmee. That would take too much time, so I'm almost positive that they are going to keep it in Eclipse. I'm hoping that they add those smaller character, but i don't think they will. I'm sure they will be mentioned, but maybe just not present in the film, because they aren't pivotal to the main plot.