Sorry, currently not supported because it is not free. Maybe I will include an option to switch between commercial versions of comskip/showanalyzer if present - although I'm not convinced with the results of automatic commercial detection. I will add this to the requested features and if I find some time, I will consider implementing it.
Cutting the mpeg2 streams is done with mencoder by the way. Only analyzing the stream is done with comskip. Cutting h264 streams is also not supported for now.
Creator of MC-TVConverter