FYI, I found the information elsewhere. Apparently, using the MC Remote, you can change the zoom options to "zoom". I didn't have to do this (as far as I remember) 4 years ago so I had NO clue!
For anyone who visits this thread looking for the same answer, there is an italic "i" on the MC remote that pulls up a little mini menu and one of the options is zoom. You can "enter" through it - I had 4 options. Why this isn't part of the WMC menu I've no idea!