I've just discovered the ability to customise MovingPictures - the plug-in for your movies in MediaPortal - mainly the ability to sections your movies.
See this thread.
This is handy for me as I wanted to section out my kids movies with our more 'adult' movies.
So entering MovingPictures now present you with the following:
Three subfolders or sections, with Olivia's Movies, All Movies and Unwatched Movies. The latter is a dynamically generated folder that is quite handy, I think!