I have asked for this already a long time ago
but I am still missing this features
1) image ratings which are displayed in windows explorer and tool like adobe lightroom are not imported in mezzmo
2) i would like to you use image metadata which is already displayed within mezzmo to create smart playlists. for example image keywords.
with these 2 easy featurés it would easily be possible to show a best of holiday slideshow for example...

by the way: another feature would be the server side (mezzmo) built in shuffle feature which my samsung tv is missing (for images)

hope this will finally be integrated