IOW, the OP would probably hit the lottery before D* does THIS!
bk63ross - if you need more tuners, why don't you just get another DVR, then you can records FOUR shows at once, while still watching a 5th pre-recorded show. It's only another $5/month & if you've been a customer for awhile, D* will probably give it to you free...
Not sure what you mean by adding a 3x4 into the DVR. The software would need to be rewritten for this as well. Not to mention two more tuners to be added. This would make it more expensive. Cheaper to just add another dual tuner receiver to the system.
I mentioned new hardware would be needed to be able to record 4 sat signals.
The better option is two DVRs, until DirecTV produces a DVR with separate outputs for two TVs.