I recently a 3 room system. One room has an R10, while the other two rooms have the standard receivers. The dish is an 18x20 with a triple LNB. I was thinking about adding an additional Tivo unit in one of the bedrooms. I am guessing that I will need to run an additional coax line to the unit. Do I have enough outputs on my current system to make this happen? If not, will it work with just one input? What functionality will I lose if I use only one input? THanks.