Leon 1.9 TDI All-wheel

Hello, someone has more detailed information why the Leon 1.9 TDI is no more than four wheel in the program? Was yesterday at the Seat dealer and he looked at me quite disenchanted as I addressed the topic. Besides, I would be interested in whether there is a possibility from the Seat house to prepare the Leon with D-net, with hands-free function etc. without half the car can be disassembled. 2Be