They do not have a product that will do that currently. However there is a device in the works called the SWM Switch. You will run all four lines from the dish into this switch outside, and one cable will come out of it. It is split back into four inside the house and you run a line to each receiver. Even the DVR's will only require one line with this new system.
For more information and a wiring diagram
click here.
-Mike