If we will use leafs, trimmings and waste materials in our oils production process, would that seriously effect the quality of the final product?

Basically, what you put in is what you get out, concentrated.  As far as "seriously effect"?  Depends on the quality of the trim and how much you mix it with your grade A material.  Leaves do not contain much oil so adding leaves will effect yeild as well as add more lipds particularly if it is Outdoor, but if you are looking to be sustainable and utilize as much of your plant material as possible you may consider using the oil from C grade material for a separate product.