Use with Video Recording Software

I have the U22mkII and a Focusrite 4 channel interface. They both work fine with Cubase but if I want to record audio for video I have to use 2 mics, as video programs always records in stereo, otherwise I just get just one side… left or right.
I am thinking of selling both to get a UR44C. If selected as source for video capture, does everything going through the mixer get fed to the stereo in for recording?
Also if I just us one mono mic, can I pan that to centre so it records on both sides of the stereo track?