New Install HD DVR and the need for 2 coax lines?

I am having my system installed next week. Now I only have one coax coming into house(one hole in wall) for my current cable setup. Now with the HD DVR I know you need two lines coming in from the dish, but what about when the coax is indoors running to receiver? Can they use one single wall outlet? Do they split the line and run two coax to the receiver? My wife does not want any other holes drilled "anywhere"(her words).
Also Would they charge me extra to run another line from the dish to the basement for future use? I will not be getting another receiver just yet.