Did you get anywhere with this?
I got a USB-UIRT and have been trying to get it setup. I was messing around with the device templates and am pretty sure that I selected "Add device template" listed underneath the "Your model is not in the list? **"
To get the Motorola codes to work, I had to select "Motorola" from the "Manufacturer" list (code 168 appears to the right after selecting)
And, I needed to select "Cable Box < AV" from the "Device Category" list (code 105)
This worked the first time (didn't know it at the time so I messed things up from there) but when I initially had it, when I tested the codes they worked. (BTW I too have a DCT700 and I used the first of the 3 options- can't seem to get back to it at this point).
So after it worked, I broke it... I tried following this:
http://wiki.linuxmce.org/index.php/Add_support_for_new_remote_controls#Sample_USB_UIRT_key_codes but that way is fairly frustrating as that you have to individually press the buttons and create a log file... cry me a river, right?
So now I'm trying to get back to the original settings. My USB UIRT 0038 is device 75 and the USB UIRT Embedded Transmit is device 76. The codes are being transmitted to device 76 which intuitively makes sense, but in reality doesn't work. Before someone suggests Seth's USB UIRT x86 Fix, it was working when I first got it installed and I didn't need to run that fix.