Along a similar vein, custom filters for digital TV would also be a good feature.
I'm thinking more in terms of splitter/decoder rather than renderer eg. MDAPIfilter. Allowing this in the graph (I'm guessing it goes between the BDA tuner/decoder and the splitter) would allow the use of SoftCAMs and encrypted/PayTV. I believe it decodes the encrypted stream into a normal TS. Some PVR software actually come with MDAPIfilter support built in I believe, but just allowing this into the filter graph would be a step towards making encrypted TV work. (BTW you still need a card reader and valid subscription for this, so I'm in no way advocating anything illegal).
For me, this would have to be after DVB-S support
SBR