If you haven't tried the DLNA feature give it a shot as DISH has been improving it. It supports a lot more file types and also adds new features including being able to fast forward and rewind.
As far a more tuners, I am told its not going to happen. The cost is to great to add them for the small amount of people who actually need more then 3 tuners. For power users who need more then 3 tuners you can get a second hopper which brings you up to a total of 6 tuners (or 8 tuners if you add OTA tuners) plus it gives you 4GB of space, allows you to have Bluetooth audio at two different locations and it actually keeps recordings more organized (throw the kids (or wife) on their own Hopper so their recordings do no clutter up your hopper.)
And the nice part is the monthly cost is the same.