You can add extra entries to the foxtelchannels.xml file using the 'configure channels' button. the file is called foxtelchannels.xml, but as long as the ozTivo site provides the EPG data using the regular prefix eg Nine-Syd then you can just add it that way. The description is freetext but will show up as the channel description when looking at MP's guide. The number is the channel number.
I'm looking at adding some more small features and i'll add your request to it
glad you found it of use!