Support for multidecrypting would allow the backend DVR-software, that is used on computer, to be able to record shows, that require a subscription card for TV-watching. NextPVR supports this feature.
http://www.nextpvr.com/nwiki/pmwiki.php?n=Configuration.DigitalDeviceSetupDialogMultidec
This feature request is legally in the grey area, so I don’t know if it will be supported.