In the Project Quotations functionality, there is option to create a Work breakdown structure, where you can create your project estimates (Costs and revenues) and include resource roles. However, in most cases, you don't necessary need to create a WBS while you are quoting clients, but you still need to be able to quote using project resource roles.

Right now, the quotation lines lists all the options you can use to quote the client, but adding the resource role an option to will be a great functionality. Since the Sales prices can be setup on a combination of resource role and Customer/contract/project etc., if the resource role can be pulled directly on the quotation lines and based on that the unit sales price can be pulled in too, this will be significant.