what is it i can't do if i don't have 2 lines going into an hdtivo? i ask since i've only ever had one line going into every tivo i've had and i didn't mind it. is the hdtivo model more handicapped then a std tivo w/o 2 lines in? i'd kinda like to keep the r10 in the room with it. and no, more lines into this room is not an option. thanks.