I did a search, but didn't see any posts for it. Does LinuxMCE support serial control of Directv receivers like the D11? I see that Mythtv does, which I assume means Linuxmce will as well.
if mythtv supports this receiver, also LMCE should work with it. you only need to make it work with mythtv. if you read this http://www.mythtv.org/wiki/index.php/Controlling_DirectTV_D11_via_USB (http://www.mythtv.org/wiki/index.php/Controlling_DirectTV_D11_via_USB), you'll be able to control it from LMCE.