I've heard of two programs back to back on the same channel record with only one tuner and keep the overlaps intact by using software to duplicate the end of the first program onto the beginning of the second program. Doesn't / didn't DTV tuners do this as some point instead of a hard cut from one program to the next?
Yes, this is the behavior I had with the HR54. Obviously, I don't have to worry about it with the Hopper3. I don't recall how the 722 worked.