To tell you the truth not reallyt sure what state this is in in the linuxmce codebase. I have a couple of the usb transeivers in my workshop but they havn't done much in the last couple of years.
I did see someones user page with a mention of iguanaIR when looking for something else.http://wiki.linuxmce.org/index.php/User:Chrysemys
This looks like it will setup the drivers and modified lirc.... but like I said I am not using them at the moment.
Just had a quick look at the LIRC_DCE code and sambuca has done a change a few months back to support sending via lirc - he might be able to shed some more light on the status of that work...
There might still be a code change to support the fact that /dev/lirc is not created but from the look of the code this might not be an issue if youe set the serial port config appropriately.
Would have to try and see...