Also, it will be a great idea if you can show Picasa Captions or ratings on WDTV which are done on Picasa library on desktop computer.
Thanks,
Ujjaval
They, good idea, I will vote for that.
Regarding your issue, I honestly think that is not possible to mark fotos as favorites, if they are located in a NAS or over the network, but I will need to double check that.