SAP Safari

SAP SD Course (TSCM60/62/64) touches the concept of Item Proposal in the Sales Document types topic. The "Implementing SAP SD" written by Glynn C Williams, normally called as 'Bible of SAP SD Consultant', elaborates more on this Item Proposal through the document type PV. However I feel that SAP Academy is missing out an intresting topic / concept of Dynamic Product Proposal and Cross Selling in its course. Wherever I showed this demo to my SAP Academy students, I was always asked "Why SAP didn't include this functionality in the course?" What is there in these topics that fascinated the students.